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that’s particularly true on the I.R.A., which has to build all these things in the real world.

we’re trying to do industrial physical transformation at a speed and scale unheralded in American history. This is bigger than anything we have done at this speed ever.

The money is beginning to move out the door now, but we’re on a clock. Climate change is not like some other issues where if you don’t solve it this year, it is exactly the same to solve it next year. This is an issue where every year you don’t solve it, the amount of greenhouse gases in the atmosphere builds, warming builds, the effects compound

Solve, frankly, isn’t the right word there because all we can do is abate, a lot of the problems now baked in. So how is it going, and who can actually walk us through that?

Robinson Meyer is the founding executive editor of heatmap.news

why do all these numbers differ so much? How big is this thing?

in electric vehicles and in the effort, kind of this dual effort in the law, to both encourage Americans to buy and use electric vehicles and then also to build a domestic manufacturing base for electric vehicles.

on both counts, the data’s really good on electric vehicles. And that’s where we’re getting the fastest response from industry and the clearest response from industry to the law.

ROBINSON MEYER: Factories are getting planned. Steel’s going in the ground. The financing for those factories is locked down. It seems like they’re definitely going to happen. They’re permitted. Companies are excited about them. Large Fortune 500 automakers are confidently and with certainty planning for an electric vehicle future, and they’re building the factories to do that in the United States. They’re also building the factories to do that not just in blue states. And so to some degree, we can see the political certainty for electric vehicles going forward.

in other parts of the law, partially due to just vagaries of how the law is being implemented, tax credits where the fine print hasn’t worked out yet, it’s too early to say whether the law is working and how it’s going and whether it’s going to accomplish its goal

EZRA KLEIN: I always find this very funny in a way. The Congressional Budget Office scored it. They thought it would make about $380 billion in climate investments over a decade. So then you have all these other analyses coming out.

But there’s actually this huge range of outcomes in between where the thing passes, and maybe what you wanted to have happen happens. Maybe it doesn’t. Implementation is where all this rubber meets the road

the Rhodium Group, which is a consulting firm, they think it could be as high as $522 billion, which is a big difference. Then there’s this Goldman Sachs estimate, which the administration loves, where they say they’re projecting $1.2 trillion in incentives —

ROBINSON MEYER: All the numbers differ because most of the important incentives, most of the important tax credits and subsidies in the I.R.A., are uncapped. There’s no limit to how much the government might spend on them. All that matters is that some private citizen or firm or organization come to the government and is like, hey, we did this. You said you’d give us money for it. Give us the money.

because of that, different banks have their own energy system models, their own models of the economy. Different research groups have their own models.

we know it’s going to be wrong because the Congressional Budget Office is actually quite constrained in how it can predict how these tax credits are taken up. And it’s constrained by the technology that’s out there in the country right now.

The C.B.O. can only look at the number of electrolyzers, kind of the existing hydrogen infrastructure in the country, and be like, well, they’re probably all going to use these tax credits. And so I think they said that there would be about $5 billion of take up for the hydrogen tax credits.

But sometimes money gets allocated, and then costs overrun, and there delays, and you can’t get the permits, and so on, and the thing never gets built

the fact that the estimates are going up is to them early evidence that this is going well. There is a lot of applications. People want the tax credits. They want to build these new factories, et cetera.

a huge fallacy that we make in policy all the time is assuming that once money is allocated for something, you get the thing you’re allocating the money for. Noah Smith, the economics writer, likes to call this checkism, that money equals stuff.

EZRA KLEIN: They do not want that, and not wanting that and putting every application through a level of scrutiny high enough to try and make sure you don’t have another one

I don’t think people think a lot about who is cutting these checks, but a lot of it is happening in this very obscure office of the Department of Energy, the Loan Program Office, which has gone from having $40 billion in lending authority, which is already a big boost over it not existing a couple decades ago, to $400 billion in loan authority,

the Loan Program Office as one of the best places we have data on how this is going right now and one of the offices that’s responded fastest to the I.R.A.

the Loan Program Office is basically the Department of Energy’s in-house bank, and it’s kind of the closest thing we have in the US to what exists in other countries, like Germany, which is a State development bank that funds projects that are eventually going to be profitable.

It has existed for some time. I mean, at first, it kind of was first to play after the Recovery Act of 2009. And in fact, early in its life, it gave a very important loan to Tesla. It gave this almost bridge loan to Tesla that helped Tesla build up manufacturing capacity, and it got Tesla to where it is today.

EZRA KLEIN: It’s because one of the questions I have about that office and that you see in some of the coverage of them is they’re very afraid of having another Solyndra.

Now, depending on other numbers, including the D.O.E., it’s potentially as high as $100 billion, but that’s because the whole thing about the I.R.A. is it’s meant to encourage the build-out of this hydrogen infrastructure.

EZRA KLEIN: I’m never that excited when I see a government loans program turning a profit because I think that tends to mean they’re not making risky enough loans. The point of the government should be to bear quite a bit of risk —

And to some degree, Ford now has to compete, and US automakers are trying to catch up with Chinese EV automakers. And its firms have EV battery technology especially, but just have kind of comprehensive understanding of the EV supply chain that no other countries’ companies have

ROBINSON MEYER: You’re absolutely right that this is the key question. They gave this $9.2 billion loan to Ford to build these EV battery plants in Kentucky and Tennessee. It’s the largest loan in the office’s history. It actually means that the investment in these factories is going to be entirely covered by the government, which is great for Ford and great for our build-out of EVs

And to some degree, I should say, one of the roles of L.P.O. and one of the roles of any kind of State development bank, right, is to loan to these big factory projects that, yes, may eventually be profitable, may, in fact, assuredly be profitable, but just aren’t there yet or need financing that the private market can’t provide. That being said, they have moved very slowly, I think.

And they feel like they’re moving quickly. They just got out new guidelines that are supposed to streamline a lot of this. Their core programs, they just redefined and streamlined in the name of speeding them up

However, so far, L.P.O. has been quite slow in getting out new loans

I want to say that the pressure they’re under is very real. Solyndra was a disaster for the Department of Energy. Whether that was fair or not fair, there’s a real fear that if you make a couple bad loans that go bad in a big way, you will destroy the political support for this program, and the money will be clawed back, a future Republican administration will wreck the office, whatever it might be. So this is not an easy call.

when you tell me they just made the biggest loan in their history to Ford, I’m not saying you shouldn’t lend any money to Ford, but when I think of what is the kind of company that cannot raise money on the capital markets, the one that comes to mind is not Ford

They have made loans to a number of more risky companies than Ford, but in addition to speed, do you think they are taking bets on the kinds of companies that need bets? It’s a little bit hard for me to believe that it would have been impossible for Ford to figure out how to finance factorie

ROBINSON MEYER: Now, I guess what I would say about that is that Ford is — let’s go back to why Solyndra failed, right? Solyndra failed because Chinese solar deluged the market. Now, why did Chinese solar deluge the market? Because there’s such support of Chinese financing from the state for massive solar factories and massive scale.

EZRA KLEIN: — the private market can’t. So that’s the meta question I’m asking here. In your view, because you’re tracking this much closer than I am, are they too much under the shadow of Solyndra? Are they being too cautious? Are they getting money out fast enough?

ROBINSON MEYER: I think that’s right; that basically, if we think the US should stay competitive and stay as close as it can and not even stay competitive, but catch up with Chinese companies, it is going to require large-scale state support of manufacturing.

EZRA KLEIN: OK, that’s fair. I will say, in general, there’s a constant thing you find reporting on government that people in government feel like they are moving very quickly

EZRA KLEIN: — given the procedural work they have to go through. And they often are moving very quickly compared to what has been done in that respect before, compared to what they have to get over. They are working weekends, they are working nights, and they are still not actually moving that quickly compared to what a VC firm can do or an investment bank or someone else who doesn’t have the weight of congressional oversight committees potentially calling you in and government procurement rules and all the rest of it.

ROBINSON MEYER: I think that’s a theme across the government’s implementation of the I.R.A. right now, is that generally the government feels like it’s moving as fast as it can. And if you look at the Department of Treasury, they feel like we are publishing — basically, the way that most of the I.R.A. subsidies work is that they will eventually be administered by the I.R.S., but first the Department of the Treasury has to write the guidebook for all these subsidies, right?

the law says there’s a very general kind of “here’s thousands of dollars for EVs under this circumstance.” Someone still has to go in and write all the fine print. The Department of Treasury is doing that right now for each tax credit, and they have to do that before anyone can claim that tax credit to the I.R.S. Treasury feels like it’s moving extremely quickly. It basically feels like it’s completely at capacity with these, and it’s sequenced these so it feels like it’s getting out the most important tax credits first.

Private industry feels like we need certainty. It’s almost a year since the law passed, and you haven’t gotten us the domestic content bonus. You haven’t gotten us the community solar bonus. You haven’t gotten us all these things yet.

a theme across the government right now is that the I.R.A. passed. Agencies have to write the regulations for all these tax credits. They feel like they’re moving very quickly, and yet companies feel like they’re not moving fast enough.

that’s how we get to this point where we’re 311 days out from the I.R.A. passing, and you’re like, well, has it made a big difference? And I’m like, well, frankly, wind and solar developers broadly don’t feel like they have the full understanding of all the subsidies they need yet to begin making the massive investments

I think it’s fair to say maybe the biggest bet on that is green hydrogen, if you’re looking in the bill.

We think it’s going to be an important tool in industry. It may be an important tool for storing energy in the power grid. It may be an important tool for anything that needs combustion.

ROBINSON MEYER: Yeah, absolutely. So green hydrogen — and let’s just actually talk about hydrogen broadly as this potential tool in the decarbonization tool kit.

It’s a molecule. It is a very light element, and you can burn it, but it’s not a fossil fuel. And a lot of the importance of hydrogen kind of comes back to that attribute of it.

So when we look at sectors of the economy that are going to be quite hard to decarbonize — and that’s because there is something about fossil fuels chemically that is essential to how that sector works either because they provide combustion heat and steelmaking or because fossil fuels are actually a chemical feedstock where the molecules in the fossil fuel are going into the product or because fossil fuels are so energy dense that you can carry a lot of energy while actually not carrying that much mass — any of those places, that’s where we look at hydrogen as going.

green hydrogen is something new, and the size of the bet is huge. So can you talk about first just what is green hydrogen? Because my understanding of it is spotty.

The I.R.A. is extremely generous — like extremely, extremely generous — in its hydrogen subsidies

The first is for what’s called blue hydrogen, which is hydrogen made from natural gas, where we then capture the carbon dioxide that was released from that process and pump it back into the ground. That’s one thing that’s subsidized. It’s basically subsidized as part of this broader set of packages targeted at carbon capture

green hydrogen, which is where we take water, use electrolyzers on it, basically zap it apart, take the hydrogen from the water, and then use that as a fue

The I.R.A. subsidies for green hydrogen specifically, which is the one with water and electricity, are so generous that relatively immediately, it’s going to have a negative cost to make green hydrogen. It will cost less than $0 to make green hydrogen. The government’s going to fully cover the cost of producing it.

That is intentional because what needs to happen now is that green hydrogen moves into places where we’re using natural gas, other places in the industrial economy, and it needs to be price competitive with those things, with natural gas, for instance. And so as it kind of is transported, it’s going to cost money

As you make the investment to replace the technology, it’s going to cost money. And so as the hydrogen moves through the system, it’s going to wind up being price competitive with natural gas, but the subsidies in the bill are so generous that hydrogen will cost less than $0 to make a kilogram of it

There seems to be a sense that hydrogen, green hydrogen, is something we sort of know how to make, but we don’t know how to make it cost competitive yet. We don’t know how to infuse it into all the processes that we need to be infused into. And so a place where the I.R.A. is trying to create a reality that does not yet exist is a reality where green hydrogen is widely used, we have to know how to use it, et cetera.

And they just seem to think we don’t. And so you need all these factories. You need all this innovation. Like, they have to create a whole innovation and supply chain almost from scratch. Is that right?

ROBINSON MEYER: That’s exactly right. There’s a great Department of Energy report that I would actually recommend anyone interested in this read called “The Liftoff Report for Clean Hydrogen.” They made it for a few other technologies. It’s a hundred-page book that’s basically how the D.O.E. believes we’re going to build out a clean hydrogen economy.

And, of course, that is policy in its own right because the D.O.E. is saying, here is the years we’re going to invest to have certain infrastructure come online. Here’s what we think we need. That’s kind of a signal to industry that everyone should plan around those years as well.

It’s a great book. It’s like the best piece of industrial policy I’ve actually seen from the government at all. But one of the points it makes is that you’re going to make green hydrogen. You’re then going to need to move it. You’re going to need to move it in a pipeline or maybe a truck or maybe in storage tanks that you then cart around.

Once it gets to a facility that uses green hydrogen, you’re going to need to store some green hydrogen there in storage tanks on site because you basically need kind of a backup supply in case your main supply fails. All of those things are going to add cost to hydrogen. And not only are they going to add cost, we don’t really know how to do them. We have very few pipelines that are hydrogen ready.

All of that investment needs to happen as a result to make the green hydrogen economy come alive. And why it’s so lavishly subsidized is to kind of fund all that downstream investment that’s eventually going to make the economy come true.

But a lot of what has to happen here, including once the money is given out, is that things we do know how to build get built, and they get built really fast, and they get built at this crazy scale.

So I’ve been reading this paper on what they call “The Greens’ Dilemma” by J.B. Ruhl and James Salzman, who also wrote this paper called “Old Green Laws, New Green Deal,” or something like that. And I think they get at the scale problem here really well.

“The largest solar facility currently online in the US is capable of generating 585 megawatts. To meet even a middle-road renewable energy scenario would require bringing online two new 400-megawatt solar power facilities, each taking up at least 2,000 acres of land every week for the next 30 years.”

And that’s just solar. We’re not talking wind there. We’re not talking any of the other stuff we’ve discussed here, transmission lines. Can we do that? Do we have that capacity?

ROBINSON MEYER: No, we do not. We absolutely do not. I think we’re going to build a ton of wind and solar. We do not right now have the system set up to use that much land to build that much new solar and wind by the time that we need to build it. I think it is partially because of permitting laws, and I think it’s also partially because right now there is no master plan

There’s no overarching strategic entity in the government that’s saying, how do we get from all these subsidies in the I.R.A. to net zero? What is our actual plan to get from where we are right now to where we’re emitting zero carbon as an economy? And without that function, no project is essential. No activity that we do absolutely needs to happen, and so therefore everything just kind of proceeds along at a convenient pace.

given the scale of what’s being attempted here, you might think that something the I.R.A. does is to have some entity in the government, as you’re saying, say, OK, we need this many solar farms. This is where we think we should put them. Let’s find some people to build them, or let’s build them ourselves.

what it actually does is there’s an office somewhere waiting for private companies to send in an application for a tax credit for solar that they say they’re going to build, and then we hope they build it

it’s an almost entirely passive process on the part of the government. Entirely would be going too far because I do think they talk to people, and they’re having conversations

the builder applies, not the government plans. Is that accurate?

ROBINSON MEYER: That’s correct. Yes.

ROBINSON MEYER: I think here’s what I would say, and this gets back to what do we want the I.R.A. to do and what are our expectations for the I.R.A

If the I.R.A. exists to build out a ton of green capacity and shift the political economy of the country toward being less dominated by fossil fuels and more dominated by the clean energy industry, frankly, then it is working

If the I.R.A. is meant to get us all the way to net zero, then it is not capable of that.

in 2022, right, we had no way to see how we were going to reduce emissions. We did not know if we were going to get a climate bill at all. Now, we have this really aggressive climate bill, and we’re like, oh, is this going to get us to net zero?

But getting to net zero was not even a possibility in 2022.

The issue is that the I.R.A. requires, ultimately, private actors to come forward and do these things. And as more and more renewables get onto the grid, almost mechanically, there’s going to be less interest in bringing the final pieces of decarbonized electricity infrastructure onto the grid as well.

EZRA KLEIN: Because the first things that get applied for are the ones that are more obviously profitable

The issue is when you talk to solar developers, they don’t see it like, “Am I going to make a ton of money, yes or no?” They see it like they have a capital stack, and they have certain incentives and certain ways to make money based off certain things they can do. And as more and more solar gets on the grid, building solar at all becomes less profitable

also, just generally, there’s less people willing to buy the solar.

as we get closer to a zero-carbon grid, there is this risk that basically less and less gets built because it will become less and less profitable

EZRA KLEIN: Let’s call that the last 20 percent risk

EZRA KLEIN: — or the last 40 percent. I mean, you can probably attach different numbers to that

ROBINSON MEYER: Permitting is the primary thing that is going to hold back any construction basically, especially out West,

right now permitting fights, the process under the National Environmental Policy Act just at the federal level, can take 4.5 years

let’s say every single project we need to do was applied for today, which is not true — those projects have not yet been applied for — they would be approved under the current permitting schedule in 2027.

ROBINSON MEYER: That’s before they get built.

Basically nobody on the left talked about permitting five years ago. I don’t want to say literally nobody, but you weren’t hearing it, including in the climate discussion.

people have moved to saying we do not have the laws, right, the permitting laws, the procurement laws to do this at the speed we’re promising, and we need to fix that. And then what you’re seeing them propose is kind of tweak oriented,

Permitting reform could mean a lot of different things, and Democrats and Republicans have different ideas about what it could mean. Environmental groups, within themselves, have different ideas about what it could mean.

for many environmental groups, the permitting process is their main tool. It is how they do the good that they see themselves doing in the world. They use the permitting process to slow down fossil fuel projects, to slow down projects that they see as harming local communities or the local environment.

ROBINSON MEYER: So we talk about the National Environmental Policy Act or NEPA. Let’s just start calling it NEPA. We talk about the NEPA process

NEPA requires the government basically study any environmental impact from a project or from a decision or from a big rule that could occur.

Any giant project in the United States goes through this NEPA process. The federal government studies what the environmental impact of the project will be. Then it makes a decision about whether to approve the project. That decision has nothing to do with the study. Now, notionally, the study is supposed to inform the project.

the decision the federal government makes, the actual “can you build this, yes or no,” legally has no connection to the study. But it must conduct the study in order to make that decision.

that permitting reform is so tough for the Democratic coalition specifically is that this process of forcing the government to amend its studies of the environmental impact of various decisions is the main tool that environmental litigation groups like Earthjustice use to slow down fossil fuel projects and use to slow down large-scale chemical or industrial projects that they don’t think should happen.

when we talk about making this program faster, and when we talk about making it more immune to litigation, they see it as we’re going to take away their main tools to fight fossil fuel infrastructure

why there’s this gap between rhetoric and what’s actually being proposed is that the same tool that is slowing down the green build-out is also what’s slowing down the fossil fuel build-out

ROBINSON MEYER: They’re the classic conflict here between the environmental movement classic, let’s call it, which was “think globally, act locally,” which said “we’re going to do everything we can to preserve the local environment,” and what the environmental movement and the climate movement, let’s say, needs to do today, which is think globally, act with an eye to what we need globally as well, which is, in some cases, maybe welcome projects that may slightly reduce local environmental quality or may seem to reduce local environmental quality in the name of a decarbonized world.

Because if we fill the atmosphere with carbon, nobody’s going to get a good environment.

Michael Gerrard, who is professor at Columbia Law School. He’s a founder of the Sabin Center for Climate Change Law there. It’s called “A Time for Triage,” and he has this sort of interesting argument that the environmental movement in general, in his view, is engaged in something he calls trade-off denial.

his view and the view of some people is that, look, the climate crisis is so bad that we just have to make those choices. We have to do things we would not have wanted to do to preserve something like the climate in which not just human civilization, but this sort of animal ecosystem, has emerged. But that’s hard, and who gets to decide which trade-offs to make?

what you’re not really seeing — not really, I would say, from the administration, even though they have some principles now; not really from California, though Gavin Newsom has a set of early things — is “this is what we think we need to make the I.R.A. happen on time, and this is how we’re going to decide what is a kind of project that gets this speedway through,” w

there’s a failure on the part of, let’s say, the environmental coalition writ large to have the courage to have this conversation and to sit down at a table and be like, “OK, we know that certain projects aren’t happening fast enough. We know that we need to build out faster. What could we actually do to the laws to be able to construct things faster and to meet our net-zero targets and to let the I.R.A. kind achieve what it could achieve?”

part of the issue is that we’re in this environment where Democrats control the Senate, Republicans control the House, and it feels very unlikely that you could just get “we are going to accelerate projects, but only those that are good for climate change,” into the law given that Republicans control the House.

part of the progressive fear here is that the right solutions must recognize climate change. Progressives are very skeptical that there are reforms that are neutral on the existence of climate change and whether we need to build faster to meet those demands that can pass through a Republican-controlled House.

one of the implications of that piece was it was maybe a huge mistake for progressives not to have figured out what they wanted here and could accept here, back when the negotiating partner was Joe Manchin.

Manchin’s bill is basically a set of moderate NEPA reforms and transmission reforms. Democrats, progressives refuse to move on it. Now, I do want to be fair here because I think Democrats absolutely should have seized on that opportunity, because it was the only moment when — we could tell already that Democrats — I mean, Democrats actually, by that moment, had lost the House.

I do want to be fair here that Manchin’s own account of what happened with this bill is that Senate Republicans killed it and that once McConnell failed to negotiate on the bill in December, Manchin’s bill was dead.

EZRA KLEIN: It died in both places.ROBINSON MEYER: It died in both places. I think that’s right.

Republicans already knew they were going to get the House, too, so they had less incentive to play along. Probably the time for this was October.

EZRA KLEIN: But it wasn’t like Democrats were trying to get this one done.

EZRA KLEIN: To your point about this was all coming down to the wire, Manchin could have let the I.R.A. pass many months before this, and they would have had more time to negotiate together, right? The fact that it was associated with Manchin in the way it was was also what made it toxic to progressives, who didn’t want to be held up by him anymore.

What becomes clear by the winter of this year, February, March of this year, is that as Democrats and Republicans begin to talk through this debt-ceiling process where, again, permitting was not the main focus. It was the federal budget. It was an entirely separate political process, basically.

EZRA KLEIN: I would say the core weirdness of the debt-ceiling fight was there was no main focus to it.

EZRA KLEIN: It wasn’t like past ones where it was about the debt. Republicans did some stuff to cut spending. They also wanted to cut spending on the I.R.S., which would increase the debt, right? It was a total mishmash of stuff happening in there.

That alchemy goes into the final debt-ceiling negotiations, which are between principals in Congress and the White House, and what we get is a set of basically the NEPA reforms in Joe Manchin’s bill from last year and the Mountain Valley pipeline, the thing that environmentalists were focused on blocking, and effectively no transmission reforms.

the set of NEPA reforms that were just enacted, that are now in the law, include — basically, the word reasonable has been inserted many times into NEPA. [LAUGHS] So the law, instead of saying the government has to study all environmental impacts, now it has to study reasonable environmental impacts.

this is a kind of climate win — has to study the environmental impacts that could result from not doing a project. The kind of average NEPA environmental impact study today is 500 pages and takes 4.5 years to produce. Under the law now, the government is supposed to hit a page limit of 150 to 300 pages.

there’s a study that’s very well cited by progressives from three professors in Utah who basically say, well, when you look at the National Forest Service, and you look at this 40,000 NEPA decisions, what mostly holds up these NEPA decisions is not like, oh, there’s too many requirements or they had to study too many things that don’t matter. It’s just there wasn’t enough staff and that staffing is primarily the big impediment. And so on the one hand, I think that’s probably accurate in that these are, in some cases — the beast has been starved, and these are very poorly staffed departments

The main progressive demand was just “we must staff it better.”

But if it’s taking you this much staffing and that much time to say something doesn’t apply to you, maybe you have a process problem —ROBINSON MEYER: Yes.EZRA KLEIN: — and you shouldn’t just throw endless resources at a broken process, which brings me — because, again, you can fall into this and never get out — I think, to the bigger critique her

these bills are almost symbolic because there’s so much else happening, and it’s really the way all this interlocks and the number of possible choke points, that if you touch one of them or even you streamline one of them, it doesn’t necessarily get you that f

“All told, over 60 federal permitting programs operate in the infrastructure approval regime, and that is just the federal system. State and local approvals and impact assessments could also apply to any project.”

their view is that under this system, it’s simply not possible to build the amount of decarbonization infrastructure we need at the pace we need it; that no amount of streamlining NEPA or streamlining, in California, CEQA will get you there; that we basically have been operating under what they call an environmental grand bargain dating back to the ’70s, where we built all of these processes to slow things down and to clean up the air and clean up the water.

we accepted this trade-off of slower building, quite a bit slower building, for a cleaner environment. And that was a good trade. It was addressing the problems of that era

now we have the problems of this era, which is we need to unbelievably, rapidly build out decarbonization infrastructure to keep the climate from warming more than we can handle and that we just don’t have a legal regime or anything.

You would need to do a whole new grand bargain for this era. And I’ve not seen that many people say that, but it seems true to me

the role that America had played in the global economy in the ’50s and ’60s where we had a ton of manufacturing, where we were kind of the factory to a world rebuilding from World War II, was no longer tenable and that, also, we wanted to focus on more of these kind of high-wage, what we would now call knowledge economy jobs.That was a large economic transition happening in the ’70s and ’80s, and it dovetailed really nicely with the environmental grand bargain.

At some point, the I.R.A. recognizes that that environmental grand bargain is no longer operative, right, because it says, we’re going to build all this big fiscal fixed infrastructure in the United States, we’re going to become a manufacturing giant again, but there has not been a recognition among either party of what exactly that will mean and what will be required to have it take hold.

It must require a form of on-the-ground, inside-the-fenceline, “at the site of the power plant” pollution control technology. The only way to do that, really, is by requiring carbon capture and requiring the large construction of major industrial infrastructure at many, many coal plants and natural gas plants around the country in order to capture carbon so it doesn’t enter the atmosphere, and so we don’t contribute to climate change. That is what the Supreme Court has ruled. Until that body changes, that is going to be the law.

So the E.P.A. has now, last month, proposed a new rule under the Clean Air Act that is going to require coal plants and some natural gas plants to install carbon capture technology to do basically what the Supreme Court has all but kind of required the E.P.A. to do

the E.P.A. has to demonstrate, in order to kind of make this rule the law and in order to make this rule pass muster with the Supreme Court, that this is tenable, that this is the best available and technologically feasible option

that means you actually have to allow carbon capture facilities to get built and you have to create a legal process that will allow carbon capture facilities to get built. And that means you need to be able to tell a power plant operator that if they capture carbon, there’s a way they can inject it back into the ground, the thing that they’re supposed to do with it.

Well, E.P.A. simultaneously has only approved the kind of well that you need to inject carbon that you’ve captured from a coal factory or a natural gas line back into the ground. It’s called a Class 6 well. The E.P.A. has only ever approved two Class 6 wells. It takes years for the E.P.A. to approve a Class 6 well.

And environmental justice groups really, really oppose these Class 6 wells because they see any carbon capture as an effort to extend the life of the fossil fuel infrastructure

The issue here is that it seems like C.C.S., carbon capture, is going to be essential to how the U.S. decarbonizes. Legally, we have no other choice because of the constraints the Supreme Court has placed on the E.P.A.. At the same time, environmental justice groups, and big green groups to some extent, oppose building out any C.C.S.

to be fair to them, right, they would say there are other ways to decarbonize. That may not be the way we’ve chosen because the politics weren’t there for it, but there are a lot of these groups that believe you could have 100 percent renewables, do not use all that much carbon capture, right? They would have liked to see a different decarbonization path taken too. I’m not sure that path is realistic.

what you do see are environmental groups opposing making it possible to build C.C.S. anywhere in the country at all.

EZRA KLEIN: The only point I’m making here is I think this is where you see a compromise a lot of them didn’t want to make —ROBINSON MEYER: Exactly, yeah.EZRA KLEIN: — which is a decarbonization strategy that actually does extend the life cycle of a lot of fossil fuel infrastructure using carbon capture. And because they never bought onto it, they’re still using the pathway they have to try to block it. The problem is that’s part of the path that’s now been chosen. So if you block it, you just don’t decarbonize. It’s not like you get the 100 percent renewable strategy.

ROBINSON MEYER: Exactly. The bargain that will emerge from that set of actions and that set of coalitional trade-offs is we will simply keep running this, and we will not cap it.

What could be possible is that progressives and Democrats and the E.P.A. turns around and says, “Oh, that’s fine. You can do C.C.S. You just have to cap every single stationary source in the country.” Like, “You want to do C.C.S.? We totally agree. Essential. You must put CSS infrastructure on every power plant, on every factory that burns fossil fuels, on everything.”

If progressives were to do that and were to get it into the law — and there’s nothing the Supreme Court has said, by the way, that would limit progressives from doing that — the upshot would be we shut down a ton more stationary sources and a ton more petrochemical refineries and these bad facilities that groups don’t want than we would under the current plan.

what is effectively going to happen is that way more factories and power plants stay open and uncapped than would be otherwise.

EZRA KLEIN: So Republican-controlled states are just on track to get a lot more of it. So the Rocky Mountain Institute estimates that red states will get $623 billion in investments by 2030 compared to $354 billion for blue states.

why are red states getting so much more of this money?

ROBINSON MEYER: I think there’s two reasons. I think, first of all, red states have been more enthusiastic about getting the money. They’re the ones giving away the tax credits. They have a business-friendly environment. And ultimately, the way many, many of these red-state governors see it is that these are just businesses.

I think the other thing is that these states, many of them, are right-to-work states. And so they might pay their workers less. They certainly face much less risk financially from a unionization campaign in their state.

regardless of the I.R.A., that’s where manufacturing and industrial investment goes in the first place. And that’s where it’s been going for 20 years because of the set of business-friendly and local subsidies and right-to-work policies.

I think the administration would say, we want this to be a big union-led effort. We want it to go to the Great Lakes states that are our political firewall.

and it would go to red states, because that’s where private industry has been locating since the ’70s and ’80s, and it would go to the Southeast, right, and the Sunbelt, and that that wouldn’t be so bad because then you would get a dynamic where red-state senators, red-state representatives, red-state governors would want to support the transition further and would certainly not support the repeal of the I.R.A. provisions and the repeal of climate provisions, and that you’d get this kind of nice vortex of the investment goes to red states, red states feel less antagonistic toward climate policies, more investment goes to red states. Red-state governors might even begin to support environmental regulation because that basically locks in benefits and advantages to the companies located in their states already.

I think what you see is that Republicans are increasingly warming to EV investment, and it’s actually building out renewables and actually building out clean electricity generation, where you see them fighting harder.

The other way that permitting matters — and this gets into the broader reason why private investment was generally going to red states and generally going to the Sunbelt — is that the Sunbelt states — Georgia, Texas — it’s easier to be there as a company because housing costs are lower and because the cost of living is lower in those states.

it’s also partially because the Sunbelt and the Southeast, it was like the last part of the country to develop, frankly, and there’s just a ton more land around all the cities, and so you can get away with the sprawling suburban growth model in those citie

It’s just cheaper to keep building suburbs there.

EZRA KLEIN: So how are you seeing the fights over these rare-earth metals and the effort to build a safe and, if not domestic, kind of friend-shored supply chain there?

Are we going to be able to source some of these minerals from the U.S.? That process seems to be proceeding but going slowly. There are some minerals we’re not going to be able to get from the United States at all and are going to have to get from our allies and partners across the world.

The kind of open question there is what exactly is the bargain we’re going to strike with countries that have these critical minerals, and will it be fair to those countries?

it isn’t to say that I think the I.R.A. on net is going to be bad for other countries. I just think we haven’t really figured out what deal and even what mechanisms we can use across the government to strike deals with other countries to mine the minerals in those countries while being fair and just and creating the kind of economic arrangement that those countries want.

, let’s say we get the minerals. Let’s say we learn how to refine them. There is many parts of the battery and many parts of EVs and many, many subcomponents in these green systems that there’s not as strong incentive to produce in the U.S.

at the same time, there’s a ton of technology. One answer to that might be to say, OK, well, what the federal government should do is just make it illegal for any of these battery makers or any of these EV companies to work with Chinese companies, so then we’ll definitely establish this parallel supply chain. We’ll learn how to make cathodes and anodes. We’ll figure it out

The issue is that there’s technology on the frontier that only Chinese companies have, and U.S. automakers need to work with those companies in order to be able to compete with them eventually.

EZRA KLEIN: How much easier would it be to achieve the I.R.A.’s goals if America’s relationship with China was more like its relationship with Germany?

ROBINSON MEYER: It would be significantly easier, and I think we’d view this entire challenge very differently, because China, as you said, not only is a leader in renewable energy. It actually made a lot of the important technological gains over the past 15 years to reducing the cost of solar and wind. It really did play a huge role on the supply side of reducing the cost of these technologies.

If we could approach that, if China were like Germany, if China were like Japan, and we could say, “Oh, this is great. China’s just going to make all these things. Our friend, China, is just going to make all these technologies, and we’re going to import them.

So it refines 75 percent of the polysilicon that you need for solar, but the machines that do the refining, 99 percent of them are made in China. I think it would be reckless for the U.S. to kind of rely on a single country and for the world to rely on a single country to produce the technologies that we need for decarbonization and unwise, regardless of our relationship with that country.

We want to geographically diversify the supply chain more, but it would be significantly easier if we did not have to also factor into this the possibility that the US is going to need to have an entirely separate supply chain to make use of for EVs, solar panels, wind turbines, batteries potentially in the near-term future.

, what are three other books they should read?

The first book is called “The End of the World” by Peter Brannen. It’s a book that’s a history of mass extinctions, the Earth’s five mass extinctions, and, actually, why he doesn’t think we’re currently in a mass extinction or why, at least, things would need to go just as bad as they are right now for thousands and thousands of years for us to be in basically the sixth extinction.

The book’s amazing for two reasons. The first is that it is the first that really got me to understand deep time.

he explains how one kind of triggered the next one. It is also an amazing book for understanding the centrality of carbon to Earth’s geological history going as far back as, basically, we can track.

“Climate Shock” by Gernot Wagner and Marty Weitzman. It’s about the economics of climate change

Marty Weitzman, who I think, until recently, was kind of the also-ran important economist of climate change. Nordhaus was the famous economist. He was the one who got all attention. He’s the one who won the Nobel.

He focuses on risk and that climate change is specifically bad because it will damage the environment, because it will make our lives worse, but it’s really specifically bad because we don’t know how bad it will be

it imposes all these huge, high end-tail risks and that blocking those tail risks is actually the main thing we want to do with climate policy.

That is I think, in some ways, what has become the U.S. approach to climate change and, to some degree, to the underlying economic thinking that drives even the I.R.A., where we want to just cut off these high-end mega warming scenarios. And this is a fantastic explanation of that particular way of thinking and of how to apply that way of thinking to climate change and also to geoengineerin

The third book, a little controversial, is called “Shorting the Grid” by Meredith Angwin

her argument is basically that electricity markets are not the right structure to organize our electricity system, and because we have chosen markets as a structured, organized electricity system in many states, we’re giving preferential treatment to natural gas and renewables, two fuels that I think climate activists may feel very different ways about, instead of coal, which she does think we should phase out, and, really, nuclear

By making it easier for renewables and natural gas to kind of accept these side payments, we made them much more profitable and therefore encouraged people to build more of them and therefore underinvested in the forms of generation, such as nuclear, that actually make most of their money by selling electrons to the grid, where they go to people’s homes.

If the world had adopted the proposal widely endorsed at the end of the ’80s — a freezing of carbon emissions, with a reduction of 20 percent by 2005 — warming could have been held to less than 1.5 degrees.

Action had to be taken, and the United States would need to lead. It didn’t.

There can be no understanding of our current and future predicament without understanding why we failed to solve this problem when we had the chance.

The first suggestion to Rafe Pomerance that humankind was destroying the conditions necessary for its own survival came on Page 66 of the government publication EPA-600/7-78-019. It was a technical report about coal

‘This Is the Whole Banana’ Spring 1979

here was an urgent problem that demanded their attention, MacDonald believed, because human civilization faced an existential crisis. In “How to Wreck the Environment,” a 1968 essay published while he was a science adviser to Lyndon Johnson, MacDonald predicted a near future in which “nuclear weapons were effectively banned and the weapons of mass destruction were those of environmental catastrophe.” One of the most potentially devastating such weapons, he believed, was the gas that we exhaled with every breath: carbon dioxide. By vastly increasing carbon emissions, the world’s most advanced militaries could alter weather patterns and wreak famine, drought and economic collapse.

the Jasons. They were like one of those teams of superheroes with complementary powers that join forces in times of galactic crisis. They had been brought together by federal agencies, including the C.I.A, to devise scientific solutions to national-security problems: how to detect an incoming missile; how to predict fallout from a nuclear bomb; how to develop unconventional weapons, like plague-infested rats.

Agle pointed to an article about a prominent geophysicist named Gordon MacDonald, who was conducting a study on climate change with the Jasons, the mysterious coterie of elite scientists to which he belonged

During the spring of 1977 and the summer of 1978, the Jasons met to determine what would happen once the concentration of carbon dioxide in the atmosphere doubled from pre-Industrial Revolution levels. It was an arbitrary milestone, the doubling, but a useful one, as its inevitability was not in question; the threshold would most likely be breached by 2035.

The Jasons’ report to the Department of Energy, “The Long-Term Impact of Atmospheric Carbon Dioxide on Climate,” was written in an understated tone that only enhanced its nightmarish findings: Global temperatures would increase by an average of two to three degrees Celsius; Dust Bowl conditions would “threaten large areas of North America, Asia and Africa”; access to drinking water and agricultural production would fall, triggering mass migration on an unprecedented scale. “Perhaps the most ominous feature,” however, was the effect of a changing climate on the poles. Even a minimal warming “could lead to rapid melting” of the West Antarctic ice sheet. The ice sheet contained enough water to raise the level of the oceans 16 feet.

MacDonald explained that he first studied the carbon-dioxide issue when he was about Pomerance’s age — in 1961, when he served as an adviser to John F. Kennedy. Pomerance pieced together that MacDonald, in his youth, had been something of a prodigy: In his 20s, he advised Dwight D. Eisenhower on space exploration; at 32, he became a member of the National Academy of Sciences; at 40, he was appointed to the inaugural Council on Environmental Quality, where he advised Richard Nixon on the environmental dangers of burning coal. He monitored the carbon-dioxide problem the whole time, with increasing alarm.

They were surprised to learn how few senior officials were familiar with the Jasons’ findings, let alone understood the ramifications of global warming. At last, having worked their way up the federal hierarchy, the two went to see the president’s top scientist, Frank Press.

Thus began the Gordon and Rafe carbon-dioxide roadshow. Beginning in the spring of 1979, Pomerance arranged informal briefings with the E.P.A., the National Security Council, The New York Times, the Council on Environmental Quality and the Energy Department, which, Pomerance learned, had established an Office of Carbon Dioxide Effects two years earlier at MacDonald’s urging

. Out of respect for MacDonald, Press had summoned to their meeting what seemed to be the entire senior staff of the president’s Office of Science and Technology Policy — the officials consulted on every critical matter of energy and national security. What Pomerance had expected to be yet another casual briefing assumed the character of a high-level national-security meeting.

MacDonald would begin his presentation by going back more than a century to John Tyndall — an Irish physicist who was an early champion of Charles Darwin’s work and died after being accidentally poisoned by his wife. In 1859, Tyndall found that carbon dioxide absorbed heat and that variations in the composition of the atmosphere could create changes in climate. These findings inspired Svante Arrhenius, a Swedish chemist and future Nobel laureate, to deduce in 1896 that the combustion of coal and petroleum could raise global temperatures. This warming would become noticeable in a few centuries, Arrhenius calculated, or sooner if consumption of fossil fuels continued to increase.

Four decades later, a British steam engineer named Guy Stewart Callendar discovered that, at the weather stations he observed, the previous five years were the hottest in recorded history. Humankind, he wrote in a paper, had become “able to speed up the processes of Nature.” That was in 1939.

MacDonald’s history concluded with Roger Revelle, perhaps the most distinguished of the priestly caste of government scientists who, since the Manhattan Project, advised every president on major policy; he had been a close colleague of MacDonald and Press since they served together under Kennedy. In a 1957 paper written with Hans Suess, Revelle concluded that “human beings are now carrying out a large-scale geophysical experiment of a kind that could not have happened in the past nor be reproduced in the future.” Revelle helped the Weather Bureau establish a continuous measurement of atmospheric carbon dioxide at a site perched near the summit of Mauna Loa on the Big Island of Hawaii, 11,500 feet above the sea — a rare pristine natural laboratory on a planet blanketed by fossil-fuel emissions.

After nearly a decade of observation, Revelle had shared his concerns with Lyndon Johnson, who included them in a special message to Congress two weeks after his inauguration. Johnson explained that his generation had “altered the composition of the atmosphere on a global scale” through the burning of fossil fuels, and his administration commissioned a study of the subject by his Science Advisory Committee. Revelle was its chairman, and its 1965 executive report on carbon dioxide warned of the rapid melting of Antarctica, rising seas, increased acidity of fresh waters — changes that would require no less than a coordinated global effort to forestall.Yet emissions continued to rise, and at this rate, MacDonald warned, they could see a snowless New England, the swamping of major coastal cities, as much as a 40 percent decline in national wheat production, the forced migration of about one-quarter of the world’s population. Not within centuries — within their own lifetimes.

On May 22, Press wrote a letter to the president of the National Academy of Sciences requesting a full assessment of the carbon-dioxide issue. Jule Charney, the father of modern meteorology, would gather the nation’s top oceanographers, atmospheric scientists and climate modelers to judge whether MacDonald’s alarm was justified — whether the world was, in fact, headed to cataclysm.

If Charney’s group confirmed that the world was careering toward an existential crisis, the president would be forced to act.

Hansen turned from the moon to Venus. Why, he tried to determine, was its surface so hot? In 1967, a Soviet satellite beamed back the answer: The planet’s atmosphere was mainly carbon dioxide. Though once it may have had habitable temperatures, it was believed to have succumbed to a runaway greenhouse effect: As the sun grew brighter, Venus’s ocean began to evaporate, thickening the atmosphere, which forced yet greater evaporation — a self-perpetuating cycle that finally boiled off the ocean entirely and heated the planet’s surface to more than 800 degrees Fahrenheit

At the other extreme, Mars’s thin atmosphere had insufficient carbon dioxide to trap much heat at all, leaving it about 900 degrees colder. Earth lay in the middle, its Goldilocks greenhouse effect just strong enough to support life.

We want to learn more about Earth’s climate, Jim told Anniek — and how humanity can influence it. He would use giant new supercomputers to map the planet’s atmosphere. They would create Mirror Worlds: parallel realities that mimicked our own. These digital simulacra, technically called “general circulation models,” combined the mathematical formulas that governed the behavior of the sea, land and sky into a single computer model. Unlike the real world, they could be sped forward to reveal the future.

The government officials, many of them scientists themselves, tried to suppress their awe of the legends in their presence: Henry Stommel, the world’s leading oceanographer; his protégé, Carl Wunsch, a Jason; the Manhattan Project alumnus Cecil Leith; the Harvard planetary physicist Richard Goody. These were the men who, in the last three decades, had discovered foundational principles underlying the relationships among sun, atmosphere, land and ocean — which is to say, the climate.

When, at Charney’s request, Hansen programmed his model to consider a future of doubled carbon dioxide, it predicted a temperature increase of four degrees Celsius. That was twice as much warming as the prediction made by the most prominent climate modeler, Syukuro Manabe, whose government lab at Princeton was the first to model the greenhouse effect. The difference between the two predictions — between warming of two degrees Celsius and four degrees Celsius — was the difference between damaged coral reefs and no reefs whatsoever, between thinning forests and forests enveloped by desert, between catastrophe and chaos.

The discrepancy between the models, Arakawa concluded, came down to ice and snow. The whiteness of the world’s snowfields reflected light; if snow melted in a warmer climate, less radiation would escape the atmosphere, leading to even greater warming. Shortly before dawn, Arakawa concluded that Manabe had given too little weight to the influence of melting sea ice, while Hansen had overemphasized it. The best estimate lay in between. Which meant that the Jasons’ calculation was too optimistic. When carbon dioxide doubled in 2035 or thereabouts, global temperatures would increase between 1.5 and 4.5 degrees Celsius, with the most likely outcome a warming of three degrees.

within the highest levels of the federal government, the scientific community and the oil-and-gas industry — within the commonwealth of people who had begun to concern themselves with the future habitability of the planet — the Charney report would come to have the authority of settled fact. It was the summation of all the predictions that had come before, and it would withstand the scrutiny of the decades that followed it. Charney’s group had considered everything known about ocean, sun, sea, air and fossil fuels and had distilled it to a single number: three. When the doubling threshold was broached, as appeared inevitable, the world would warm three degrees Celsius

The last time the world was three degrees warmer was during the Pliocene, three million years ago, when beech trees grew in Antarctica, the seas were 80 feet higher and horses galloped across the Canadian coast of the Arctic Ocean.

After the publication of the Charney report, Exxon decided to create its own dedicated carbon-dioxide research program, with an annual budget of $600,000. Only Exxon was asking a slightly different question than Jule Charney. Exxon didn’t concern itself primarily with how much the world would warm. It wanted to know how much of the warming Exxon could be blamed for.

“It behooves us to start a very aggressive defensive program,” Shaw wrote in a memo to a manager, “because there is a good probability that legislation affecting our business will be passed.”

Shaw turned to Wallace Broecker, a Columbia University oceanographer who was the second author of Roger Revelle’s 1965 carbon-dioxide report for Lyndon Johnson. In 1977, in a presentation at the American Geophysical Union, Broecker predicted that fossil fuels would have to be restricted, whether by taxation or fiat. More recently, he had testified before Congress, calling carbon dioxide “the No.1 long-term environmental problem.” If presidents and senators trusted Broecker to tell them the bad news, he was good enough for Exxon.

The company had been studying the carbon-dioxide problem for decades, since before it changed its name to Exxon. In 1957, scientists from Humble Oil published a study tracking “the enormous quantity of carbon dioxide” contributed to the atmosphere since the Industrial Revolution “from the combustion of fossil fuels.” Even then, the observation that burning fossil fuels had increased the concentration of carbon in the atmosphere was well understood and accepted by Humble’s scientists.

The American Petroleum Institute, the industry’s largest trade association, asked the same question in 1958 through its air-pollution study group and replicated the findings made by Humble Oil. So did another A.P.I. study conducted by the Stanford Research Institute a decade later, in 1968, which concluded that the burning of fossil fuels would bring “significant temperature changes” by the year 2000 and ultimately “serious worldwide environmental changes,” including the melting of the Antarctic ice cap and rising seas.

The ritual repeated itself every few years. Industry scientists, at the behest of their corporate bosses, reviewed the problem and found good reasons for alarm and better excuses to do nothing. Why should they act when almost nobody within the United States government — nor, for that matter, within the environmental movement — seemed worried?

Why take on an intractable problem that would not be detected until this generation of employees was safely retired? Worse, the solutions seemed more punitive than the problem itself. Historically, energy use had correlated to economic growth — the more fossil fuels we burned, the better our lives became. Why mess with that?

That June, Jimmy Carter signed the Energy Security Act of 1980, which directed the National Academy of Sciences to start a multiyear, comprehensive study, to be called “Changing Climate,” that would analyze social and economic effects of climate change. More urgent, the National Commission on Air Quality, at the request of Congress, invited two dozen experts, including Henry Shaw himself, to a meeting in Florida to propose climate policy.

On April 3, 1980, Senator Paul Tsongas, a Massachusetts Democrat, held the first congressional hearing on carbon-dioxide buildup in the atmosphere. Gordon MacDonald testified that the United States should “take the initiative” and develop, through the United Nations, a way to coordinate every nation’s energy policies to address the problem.

During the expansion of the Clean Air Act, he pushed for the creation of the National Commission on Air Quality, charged with ensuring that the goals of the act were being met. One such goal was a stable global climate. The Charney report had made clear that goal was not being met, and now the commission wanted to hear proposals for legislation. It was a profound responsibility, and the two dozen experts invited to the Pink Palace — policy gurus, deep thinkers, an industry scientist and an environmental activist — had only three days to achieve it, but the utopian setting made everything seem possible

We have less time than we realize, said an M.I.T. nuclear engineer named David Rose, who studied how civilizations responded to large technological crises. “People leave their problems until the 11th hour, the 59th minute,” he said. “And then: ‘Eloi, Eloi, Lama Sabachthani?’ ” — “My God, my God, why hast thou forsaken me?”

The attendees seemed to share a sincere interest in finding solutions. They agreed that some kind of international treaty would ultimately be needed to keep atmospheric carbon dioxide at a safe level. But nobody could agree on what that level was.

William Elliott, a NOAA scientist, introduced some hard facts: If the United States stopped burning carbon that year, it would delay the arrival of the doubling threshold by only five years. If Western nations somehow managed to stabilize emissions, it would forestall the inevitable by only eight years. The only way to avoid the worst was to stop burning coal. Yet China, the Soviet Union and the United States, by far the world’s three largest coal producers, were frantically accelerating extraction.

“Do we have a problem?” asked Anthony Scoville, a congressional science consultant. “We do, but it is not the atmospheric problem. It is the political problem.” He doubted that any scientific report, no matter how ominous its predictions, would persuade politicians to act.

The talk of ending oil production stirred for the first time the gentleman from Exxon. “I think there is a transition period,” Henry Shaw said. “We are not going to stop burning fossil fuels and start looking toward solar or nuclear fusion and so on. We are going to have a very orderly transition from fossil fuels to renewable energy sources.”

What if the problem was that they were thinking of it as a problem? “What I am saying,” Scoville continued, “is that in a sense we are making a transition not only in energy but the economy as a whole.” Even if the coal and oil industries collapsed, renewable technologies like solar energy would take their place. Jimmy Carter was planning to invest $80 billion in synthetic fuel. “My God,” Scoville said, “with $80 billion, you could have a photovoltaics industry going that would obviate the need for synfuels forever!”

nobody could agree what to do. John Perry, a meteorologist who had worked as a staff member on the Charney report, suggested that American energy policy merely “take into account” the risks of global warming, though he acknowledged that a nonbinding measure might seem “intolerably stodgy.” “It is so weak,” Pomerance said, the air seeping out of him, “as to not get us anywhere.”

Scoville pointed out that the United States was responsible for the largest share of global carbon emissions. But not for long. “If we’re going to exercise leadership,” he said, “the opportunity is now.

One way to lead, he proposed, would be to classify carbon dioxide as a pollutant under the Clean Air Act and regulate it as such. This was received by the room like a belch. By Scoville’s logic, every sigh was an act of pollution. Did the science really support such an extreme measure? The Charney report did exactly that, Pomerance said.

Slade, the director of the Energy Department’s carbon-dioxide program, considered the lag a saving grace. If changes did not occur for a decade or more, he said, those in the room couldn’t be blamed for failing to prevent them. So what was the problem?

“Call it whatever.” Besides, Pomerance added, they didn’t have to ban coal tomorrow. A pair of modest steps could be taken immediately to show the world that the United States was serious: the implementation of a carbon tax and increased investment in renewable energy. Then the United States could organize an international summit meeting to address climate change

these two dozen experts, who agreed on the major points and had made a commitment to Congress, could not draft a single paragraph. Hours passed in a hell of fruitless negotiation, self-defeating proposals and impulsive speechifying. Pomerance and Scoville pushed to include a statement calling for the United States to “sharply accelerate international dialogue,” but they were sunk by objections and caveats.

They never got to policy proposals. They never got to the second paragraph. The final statement was signed by only the moderator, who phrased it more weakly than the declaration calling for the workshop in the first place. “The guide I would suggest,” Jorling wrote, “is whether we know enough not to recommend changes in existing policy.”

Pomerance had seen enough. A consensus-based strategy would not work — could not work — without American leadership. And the United States wouldn’t act unless a strong leader persuaded it to do so — someone who would speak with authority about the science, demand action from those in power and risk everything in pursuit of justice.

The meeting ended Friday morning. On Tuesday, four days later, Ronald Reagan was elected president.

‘Otherwise, They’ll Gurgle’ November 1980-September 1981

In the midst of this carnage, the Council on Environmental Quality submitted a report to the White House warning that fossil fuels could “permanently and disastrously” alter Earth’s atmosphere, leading to “a warming of the Earth, possibly with very serious effects.” Reagan did not act on the council’s advice. Instead, his administration considered eliminating the council.

After the election, Reagan considered plans to close the Energy Department, increase coal production on federal land and deregulate surface coal mining. Once in office, he appointed James Watt, the president of a legal firm that fought to open public lands to mining and drilling, to run the Interior Department. “We’re deliriously happy,” the president of the National Coal Association was reported to have said. Reagan preserved the E.P.A. but named as its administrator Anne Gorsuch, an anti-regulation zealot who proceeded to cut the agency’s staff and budget by about a quarter

Reagan “has declared open war on solar energy,” the director of the nation’s lead solar-energy research agency said, after he was asked to resign). Reagan appeared determined to reverse the environmental achievements of Jimmy Carter, before undoing those of Richard Nixon, Lyndon Johnson, John F. Kennedy and, if he could get away with it, Theodore Roosevelt.

When Reagan considered closing the Council on Environmental Quality, its acting chairman, Malcolm Forbes Baldwin, wrote to the vice president and the White House chief of staff begging them to reconsider; in a major speech the same week, “A Conservative’s Program for the Environment,” Baldwin argued that it was “time for today’s conservatives explicitly to embrace environmentalism.” Environmental protection was not only good sense. It was good business. What could be more conservative than an efficient use of resources that led to fewer federal subsidies?

Meanwhile the Charney report continued to vibrate at the periphery of public consciousness. Its conclusions were confirmed by major studies from the Aspen Institute, the International Institute for Applied Systems Analysis near Vienna and the American Association for the Advancement of Science. Every month or so, nationally syndicated articles appeared summoning apocalypse: “Another Warning on ‘Greenhouse Effect,’ ” “Global Warming Trend ‘Beyond Human Experience,’ ” “Warming Trend Could ‘Pit Nation Against Nation.’

Pomerance read on the front page of The New York Times on Aug. 22, 1981, about a forthcoming paper in Science by a team of seven NASA scientists. They had found that the world had already warmed in the past century. Temperatures hadn’t increased beyond the range of historical averages, but the scientists predicted that the warming signal would emerge from the noise of routine weather fluctuations much sooner than previously expected. Most unusual of all, the paper ended with a policy recommendation: In the coming decades, the authors wrote, humankind should develop alternative sources of energy and use fossil fuels only “as necessary.” The lead author was James Hansen.

Pomerance listened and watched. He understood Hansen’s basic findings well enough: Earth had been warming since 1880, and the warming would reach “almost unprecedented magnitude” in the next century, leading to the familiar suite of terrors, including the flooding of a 10th of New Jersey and a quarter of Louisiana and Florida. But Pomerance was excited to find that Hansen could translate the complexities of atmospheric science into plain English.

7. ‘We’re All Going to Be the Victims’ March 1982

Gore had learned about climate change a dozen years earlier as an undergraduate at Harvard, when he took a class taught by Roger Revelle. Humankind was on the brink of radically transforming the global atmosphere, Revelle explained, drawing Keeling’s rising zigzag on the blackboard, and risked bringing about the collapse of civilization. Gore was stunned: Why wasn’t anyone talking about this?

Most in Congress considered the science committee a legislative backwater, if they considered it at all; this made Gore’s subcommittee, which had no legislative authority, an afterthought to an afterthought. That, Gore vowed, would change. Environmental and health stories had all the elements of narrative drama: villains, victims and heroes. In a hearing, you could summon all three, with the chairman serving as narrator, chorus and moral authority. He told his staff director that he wanted to hold a hearing every week.

The Revelle hearing went as Grumbly had predicted. The urgency of the issue was lost on Gore’s older colleagues, who drifted in and out while the witnesses testified. There were few people left by the time the Brookings Institution economist Lester Lave warned that humankind’s profligate exploitation of fossil fuels posed an existential test to human nature. “Carbon dioxide stands as a symbol now of our willingness to confront the future,” he said. “It will be a sad day when we decide that we just don’t have the time or thoughtfulness to address those issues.”

That night, the news programs featured the resolution of the baseball strike, the ongoing budgetary debate and the national surplus of butter.

There emerged, despite the general comity, a partisan divide. Unlike the Democrats, the Republicans demanded action. “Today I have a sense of déjà vu,” said Robert Walker, a Republican from Pennsylvania. In each of the last five years, he said, “we have been told and told and told that there is a problem with the increasing carbon dioxide in the atmosphere. We all accept that fact, and we realize that the potential consequences are certainly major in their impact on mankind.” Yet they had failed to propose a single law. “Now is the time,” he said. “The research is clear. It is up to us now to summon the political will.”

Hansen flew to Washington to testify on March 25, 1982, performing before a gallery even more thinly populated than at Gore’s first hearing on the greenhouse effect. Gore began by attacking the Reagan administration for cutting funding for carbon-dioxide research despite the “broad consensus in the scientific community that the greenhouse effect is a reality.” William Carney, a Republican from New York, bemoaned the burning of fossil fuels and argued passionately that science should serve as the basis for legislative policy

the experts invited by Gore agreed with the Republicans: The science was certain enough. Melvin Calvin, a Berkeley chemist who won the Nobel Prize for his work on the carbon cycle, said that it was useless to wait for stronger evidence of warming. “You cannot do a thing about it when the signals are so big that they come out of the noise,” he said. “You have to look for early warning signs.”

Hansen’s job was to share the warning signs, to translate the data into plain English. He explained a few discoveries that his team had made — not with computer models but in libraries. By analyzing records from hundreds of weather stations, he found that the surface temperature of the planet had already increased four-tenths of a degree Celsius in the previous century. Data from several hundred tide-gauge stations showed that the oceans had risen four inches since the 1880s

It occurred to Hansen that this was the only political question that mattered: How long until the worst began? It was not a question on which geophysicists expended much effort; the difference between five years and 50 years in the future was meaningless in geologic time. Politicians were capable of thinking only in terms of electoral time: six years, four years, two years. But when it came to the carbon problem, the two time schemes were converging.

“Within 10 or 20 years,” Hansen said, “we will see climate changes which are clearly larger than the natural variability.” James Scheuer wanted to make sure he understood this correctly. No one else had predicted that the signal would emerge that quickly. “If it were one or two degrees per century,” he said, “that would be within the range of human adaptability. But we are pushing beyond the range of human adaptability.” “Yes,” Hansen said.

How soon, Scheuer asked, would they have to change the national model of energy production? Hansen hesitated — it wasn’t a scientific question. But he couldn’t help himself. He had been irritated, during the hearing, by all the ludicrous talk about the possibility of growing more trees to offset emissions. False hopes were worse than no hope at all: They undermined the prospect of developing real solutions. “That time is very soon,” Hansen said finally. “My opinion is that it is past,” Calvin said, but he was not heard because he spoke from his seat. He was told to speak into the microphone. “It is already later,” Calvin said, “than you think.”

From Gore’s perspective, the hearing was an unequivocal success. That night Dan Rather devoted three minutes of “CBS Evening News” to the greenhouse effect. A correspondent explained that temperatures had increased over the previous century, great sheets of pack ice in Antarctica were rapidly melting, the seas were rising; Calvin said that “the trend is all in the direction of an impending catastrophe”; and Gore mocked Reagan for his shortsightedness. Later, Gore could take credit for protecting the Energy Department’s carbon-dioxide program, which in the end was largely preserved.

8. ‘The Direction of an Impending Catastrophe’ 1982

Following Henry Shaw’s recommendation to establish credibility ahead of any future legislative battles, Exxon had begun to spend conspicuously on global-warming research. It donated tens of thousands of dollars to some of the most prominent research efforts, including one at Woods Hole led by the ecologist George Woodwell, who had been calling for major climate policy as early as the mid-1970s, and an international effort coordinated by the United Nations. Now Shaw offered to fund the October 1982 symposium on climate change at Columbia’s Lamont-Doherty campus.

David boasted that Exxon would usher in a new global energy system to save the planet from the ravages of climate change. He went so far as to argue that capitalism’s blind faith in the wisdom of the free market was “less than satisfying” when it came to the greenhouse effect. Ethical considerations were necessary, too. He pledged that Exxon would revise its corporate strategy to account for climate change, even if it were not “fashionable” to do so. As Exxon had already made heavy investments in nuclear and solar technology, he was “generally upbeat” that Exxon would “invent” a future of renewable energy.

Hansen had reason to feel upbeat himself. If the world’s largest oil-and-gas company supported a new national energy model, the White House would not stand in its way. The Reagan administration was hostile to change from within its ranks. But it couldn’t be hostile to Exxon.

The carbon-dioxide issue was beginning to receive major national attention — Hansen’s own findings had become front-page news, after all. What started as a scientific story was turning into a political story.

The political realm was itself a kind of Mirror World, a parallel reality that crudely mimicked our own. It shared many of our most fundamental laws, like the laws of gravity and inertia and publicity. And if you applied enough pressure, the Mirror World of politics could be sped forward to reveal a new future. Hansen was beginning to understand that too.

1. ‘Caution, Not Panic’ 1983-1984

in the fall of 1983, the climate issue entered an especially long, dark winter. And all because of a single report that had done nothing to change the state of climate science but transformed the state of climate politics.

After the publication of the Charney report in 1979, Jimmy Carter had directed the National Academy of Sciences to prepare a comprehensive, $1 million analysis of the carbon-dioxide problem: a Warren Commission for the greenhouse effect. A team of scientist-dignitaries — among them Revelle, the Princeton modeler Syukuro Manabe and the Harvard political economist Thomas Schelling, one of the intellectual architects of Cold War game theory — would review the literature, evaluate the consequences of global warming for the world order and propose remedies

Then Reagan won the White House.

the incipient report served as the Reagan administration’s answer to every question on the subject. There could be no climate policy, Fred Koomanoff and his associates said, until the academy ruled. In the Mirror World of the Reagan administration, the warming problem hadn’t been abandoned at all. A careful, comprehensive solution was being devised. Everyone just had to wait for the academy’s elders to explain what it was.

The committee’s chairman, William Nierenberg — a Jason, presidential adviser and director of Scripps, the nation’s pre-eminent oceanographic institution — argued that action had to be taken immediately, before all the details could be known with certainty, or else it would be too late.

Better to bet on American ingenuity to save the day. Major interventions in national energy policy, taken immediately, might end up being more expensive, and less effective, than actions taken decades in the future, after more was understood about the economic and social consequences of a warmer planet. Yes, the climate would change, mostly for the worst, but future generations would be better equipped to change with it.

Government officials who knew Nierenberg were not surprised by his conclusions: He was an optimist by training and experience, a devout believer in the doctrine of American exceptionalism, one of the elite class of scientists who had helped the nation win a global war, invent the most deadly weapon conceivable and create the booming aerospace and computer industries. America had solved every existential problem it had confronted over the previous generation; it would not be daunted by an excess of carbon dioxide. Nierenberg had also served on Reagan’s transition team. Nobody believed that he had been directly influenced by his political connections, but his views — optimistic about the saving graces of market forces, pessimistic about the value of government regulation — reflected all the ardor of his party.

That’s what Nierenberg wrote in “Changing Climate.” But it’s not what he said in the press interviews that followed. He argued the opposite: There was no urgent need for action. The public should not entertain the most “extreme negative speculations” about climate change (despite the fact that many of those speculations appeared in his report). Though “Changing Climate” urged an accelerated transition to renewable fuels, noting that it would take thousands of years for the atmosphere to recover from the damage of the last century, Nierenberg recommended “caution, not panic.” Better to wait and see

The damage of “Changing Climate” was squared by the amount of attention it received. Nierenberg’s speech in the Great Hall, being one-500th the length of the actual assessment, received 500 times the press coverage. As The Wall Street Journal put it, in a line echoed by trade journals across the nation: “A panel of top scientists has some advice for people worried about the much-publicized warming of the Earth’s climate: You can cope.”

On “CBS Evening News,” Dan Rather said the academy had given “a cold shoulder” to a grim, 200-page E.P.A. assessment published earlier that week (titled “Can We Delay a Greenhouse Warming?”; the E.P.A.’s answer, reduced to a word, was no). The Washington Post described the two reports, taken together, as “clarion calls to inaction.

George Keyworth II, Reagan’s science adviser. Keyworth used Nierenberg’s optimism as reason to discount the E.P.A.’s “unwarranted and unnecessarily alarmist” report and warned against taking any “near-term corrective action” on global warming. Just in case it wasn’t clear, Keyworth added, “there are no actions recommended other than continued research.”

Edward David Jr., two years removed from boasting of Exxon’s commitment to transforming global energy policy, told Science that the corporation had reconsidered. “Exxon has reverted to being mainly a supplier of conventional hydrocarbon fuels — petroleum products, natural gas and steam coal,” David said. The American Petroleum Institute canceled its own carbon-dioxide research program, too.

Exxon soon revised its position on climate-change research. In a presentation at an industry conference, Henry Shaw cited “Changing Climate” as evidence that “the general consensus is that society has sufficient time to technologically adapt to a CO₂ greenhouse effect.” If the academy had concluded that regulations were not a serious option, why should Exxon protest

2. ‘You Scientists Win’ 1985

3. The Size of The Human Imagination Spring-Summer 1986

Curtis Moore’s proposal: Use ozone to revive climate. The ozone hole had a solution — an international treaty, already in negotiation. Why not hitch the milk wagon to the bullet train? Pomerance was skeptical. The problems were related, sure: Without a reduction in CFC emissions, you didn’t have a chance of averting cataclysmic global warming. But it had been difficult enough to explain the carbon issue to politicians and journalists; why complicate the sales pitch? Then again, he didn’t see what choice he had. The Republicans controlled the Senate, and Moore was his connection to the Senate’s environmental committee.

Pomerance met with Senator John Chafee, a Republican from Rhode Island, and helped persuade him to hold a double-barreled hearing on the twin problems of ozone and carbon dioxide on June 10 and 11, 1986

F.Sherwood Rowland, Robert Watson, a NASA scientist, and Richard Benedick, the administration’s lead representative in international ozone negotiations, would discuss ozone; James Hansen, Al Gore, the ecologist George Woodwell and Carl Wunsch, a veteran of the Charney group, would testify about climate change.

As Pomerance had hoped, fear about the ozone layer ensured a bounty of press coverage for the climate-change testimony. But as he had feared, it caused many people to conflate the two crises. One was Peter Jennings, who aired the video on ABC’s “World News Tonight,” warning that the ozone hole “could lead to flooding all over the world, also to drought and to famine.”

The confusion helped: For the first time since the “Changing Climate” report, global-warming headlines appeared by the dozen. William Nierenberg’s “caution, not panic” line was inverted. It was all panic without a hint of caution: “A Dire Forecast for ‘Greenhouse’ Earth” (the front page of The Washington Post); “Scientists Predict Catastrophes in Growing Global Heat Wave” (Chicago Tribune); “Swifter Warming of Globe Foreseen” (The New York Times).

After three years of backsliding and silence, Pomerance was exhilarated to see interest in the issue spike overnight. Not only that: A solution materialized, and a moral argument was passionately articulated — by Rhode Island’s Republican senator no less. “Ozone depletion and the greenhouse effect can no longer be treated solely as important scientific questions,” Chafee said. “They must be seen as critical problems facing the nations of the world, and they are problems that demand solutions.”

The old canard about the need for more research was roundly mocked — by Woodwell, by a W.R.I. colleague named Andrew Maguire, by Senator George Mitchell, a Democrat from Maine. “Scientists are never 100 percent certain,” the Princeton historian Theodore Rabb testified. “That notion of total certainty is something too elusive ever to be sought.” As Pomerance had been saying since 1979, it was past time to act. Only now the argument was so broadly accepted that nobody dared object.

The ozone hole, Pomerance realized, had moved the public because, though it was no more visible than global warming, people could be made to see it. They could watch it grow on video. Its metaphors were emotionally wrought: Instead of summoning a glass building that sheltered plants from chilly weather (“Everything seems to flourish in there”), the hole evoked a violent rending of the firmament, inviting deathly radiation. Americans felt that their lives were in danger. An abstract, atmospheric problem had been reduced to the size of the human imagination. It had been made just small enough, and just large enough, to break through.

Four years after “Changing Climate,” two years after a hole had torn open the firmament and a month after the United States and more than three dozen other nations signed a treaty to limit use of CFCs, the climate-change corps was ready to celebrate. It had become conventional wisdom that climate change would follow ozone’s trajectory. Reagan’s E.P.A. administrator, Lee M. Thomas, said as much the day he signed the Montreal Protocol on Substances That Deplete the Ozone Layer (the successor to the Vienna Convention), telling reporters that global warming was likely to be the subject of a future international agreement

Congress had already begun to consider policy — in 1987 alone, there were eight days of climate hearings, in three committees, across both chambers of Congress; Senator Joe Biden, a Delaware Democrat, had introduced legislation to establish a national climate-change strategy. And so it was that Jim Hansen found himself on Oct. 27 in the not especially distinguished ballroom of the Quality Inn on New Jersey Avenue, a block from the Capitol, at “Preparing for Climate Change,” which was technically a conference but felt more like a wedding.

John Topping was an old-line Rockefeller Republican, a Commerce Department lawyer under Nixon and an E.P.A. official under Reagan. He first heard about the climate problem in the halls of the E.P.A. in 1982 and sought out Hansen, who gave him a personal tutorial. Topping was amazed to discover that out of the E.P.A.’s 13,000-person staff, only seven people, by his count, were assigned to work on climate, though he figured it was more important to the long-term security of the nation than every other environmental issue combined.

Glancing around the room, Jim Hansen could chart, like an arborist counting rings on a stump, the growth of the climate issue over the decade. Veterans like Gordon MacDonald, George Woodwell and the environmental biologist Stephen Schneider stood at the center of things. Former and current staff members from the congressional science committees (Tom Grumbly, Curtis Moore, Anthony Scoville) made introductions to the congressmen they advised. Hansen’s owlish nemesis Fred Koomanoff was present, as were his counterparts from the Soviet Union and Western Europe. Rafe Pomerance’s cranium could be seen above the crowd, but unusually he was surrounded by colleagues from other environmental organizations that until now had shown little interest in a diffuse problem with no proven fund-raising record. The party’s most conspicuous newcomers, however, the outermost ring, were the oil-and-gas executives.

That evening, as a storm spat and coughed outside, Rafe Pomerance gave one of his exhortative speeches urging cooperation among the various factions, and John Chafee and Roger Revelle received awards; introductions were made and business cards earnestly exchanged. Not even a presentation by Hansen of his research could sour the mood. The next night, on Oct. 28, at a high-spirited dinner party in Topping’s townhouse on Capitol Hill, the oil-and-gas men joked with the environmentalists, the trade-group representatives chatted up the regulators and the academics got merrily drunk. Mikhail Budyko, the don of the Soviet climatologists, settled into an extended conversation about global warming with Topping’s 10-year-old son. It all seemed like the start of a grand bargain, a uniting of factions — a solution.

Hansen was accustomed to the bureaucratic nuisances that attended testifying before Congress; before a hearing, he had to send his formal statement to NASA headquarters, which forwarded it to the White House’s Office of Management and Budget for approval. “Major greenhouse climate changes are a certainty,” he had written. “By the 2010s [in every scenario], essentially the entire globe has very substantial warming.”

By all appearances, plans for major policy continued to advance rapidly. After the Johnston hearing, Timothy Wirth, a freshman Democratic senator from Colorado on the energy committee, began to plan a comprehensive package of climate-change legislation — a New Deal for global warming. Wirth asked a legislative assistant, David Harwood, to consult with experts on the issue, beginning with Rafe Pomerance, in the hope of converting the science of climate change into a new national energy policy.

In March 1988, Wirth joined 41 other senators, nearly half of them Republicans, to demand that Reagan call for an international treaty modeled after the ozone agreement. Because the United States and the Soviet Union were the world’s two largest contributors of carbon emissions, responsible for about one-third of the world total, they should lead the negotiations. Reagan agreed. In May, he signed a joint statement with Mikhail Gorbachev that included a pledge to cooperate on global warming.

Al Gore himself had, for the moment, withdrawn his political claim to the issue. In 1987, at the age of 39, Gore announced that he was running for president, in part to bring attention to global warming, but he stopped emphasizing it after the subject failed to captivate New Hampshire primary voters.

5. ‘You Will See Things That You Shall Believe’ Summer 1988

It was the hottest and driest summer in history. Everywhere you looked, something was bursting into flames. Two million acres in Alaska incinerated, and dozens of major fires scored the West. Yellowstone National Park lost nearly one million acres. Smoke was visible from Chicago, 1,600 miles away.

In Nebraska, suffering its worst drought since the Dust Bowl, there were days when every weather station registered temperatures above 100 degrees. The director of the Kansas Department of Health and Environment warned that the drought might be the dawning of a climatic change that within a half century could turn the state into a desert.

On June 22 in Washington, where it hit 100 degrees, Rafe Pomerance received a call from Jim Hansen, who was scheduled to testify the following morning at a Senate hearing called by Timothy Wirth. “I hope we have good media coverage tomorrow,” Hansen said.

Hansen had just received the most recent global temperature data. Just over halfway into the year, 1988 was setting records. Already it had nearly clinched the hottest year in history. Ahead of schedule, the signal was emerging from the noise. “I’m going to make a pretty strong statement,” Hansen said.

Hansen returned to his testimony. He wrote: “The global warming is now large enough that we can ascribe with a high degree of confidence a cause-and-effect relationship to the greenhouse effect.” He wrote: “1988 so far is so much warmer than 1987, that barring a remarkable and improbable cooling, 1988 will be the warmest year on record.” He wrote: “The greenhouse effect has been detected, and it is changing our climate now.”

“We have only one planet,” Senator Bennett Johnston intoned. “If we screw it up, we have no place to go.” Senator Max Baucus, a Democrat from Montana, called for the United Nations Environment Program to begin preparing a global remedy to the carbon-dioxide problem. Senator Dale Bumpers, a Democrat of Arkansas, previewed Hansen’s testimony, saying that it “ought to be cause for headlines in every newspaper in America tomorrow morning.” The coverage, Bumpers emphasized, was a necessary precursor to policy. “Nobody wants to take on any of the industries that produce the things that we throw up into the atmosphere,” he said. “But what you have are all these competing interests pitted against our very survival.”

Hansen, wiping his brow, spoke without affect, his eyes rarely rising from his notes. The warming trend could be detected “with 99 percent confidence,” he said. “It is changing our climate now.” But he saved his strongest comment for after the hearing, when he was encircled in the hallway by reporters. “It is time to stop waffling so much,” he said, “and say that the evidence is pretty strong that the greenhouse effect is here.”

The press followed Bumpers’s advice. Hansen’s testimony prompted headlines in dozens of newspapers across the country, including The New York Times, which announced, across the top of its front page: “Global Warming Has Begun, Expert Tells Senate.”

Rafe Pomerance called his allies on Capitol Hill, the young staff members who advised politicians, organized hearings, wrote legislation. We need to finalize a number, he told them, a specific target, in order to move the issue — to turn all this publicity into policy. The Montreal Protocol had called for a 50 percent reduction in CFC emissions by 1998. What was the right target for carbon emissions? It wasn’t enough to exhort nations to do better. That kind of talk might sound noble, but it didn’t change investments or laws. They needed a hard goal — something ambitious but reasonable. And they needed it soon: Just four days after Hansen’s star turn, politicians from 46 nations and more than 300 scientists would convene in Toronto at the World Conference on the Changing Atmosphere, an event described by Philip Shabecoff of The New York Times as “Woodstock for climate change.”

Pomerance had a proposal: a 20 percent reduction in carbon emissions by 2000. Ambitious, Harwood said. In all his work planning climate policy, he had seen no assurance that such a steep drop in emissions was possible. Then again, 2000 was more than a decade off, so it allowed for some flexibility.

Mintzer pointed out that a 20 percent reduction was consistent with the academic literature on energy efficiency. Various studies over the years had shown that you could improve efficiency in most energy systems by roughly 20 percent if you adopted best practices.

Of course, with any target, you had to take into account the fact that the developing world would inevitably consume much larger quantities of fossil fuels by 2000. But those gains could be offset by a wider propagation of the renewable technologies already at hand — solar, wind, geothermal. It was not a rigorous scientific analysis, Mintzer granted, but 20 percent sounded plausible. We wouldn’t need to solve cold fusion or ask Congress to repeal the law of gravity. We could manage it with the knowledge and technology we already had.

Besides, Pomerance said, 20 by 2000 sounds good.

The conference’s final statement, signed by all 400 scientists and politicians in attendance, repeated the demand with a slight variation: a 20 percent reduction in carbon emissions by 2005. Just like that, Pomerance’s best guess became global diplomatic policy.

Hansen, emerging from Anniek’s successful cancer surgery, took it upon himself to start a one-man public information campaign. He gave news conferences and was quoted in seemingly every article about the issue; he even appeared on television with homemade props. Like an entrant at an elementary-school science fair, he made “loaded dice” out of sections of cardboard and colored paper to illustrate the increased likelihood of hotter weather in a warmer climate. Public awareness of the greenhouse effect reached a new high of 68 percent

global warming became a major subject of the presidential campaign. While Michael Dukakis proposed tax incentives to encourage domestic oil production and boasted that coal could satisfy the nation’s energy needs for the next three centuries, George Bush took advantage. “I am an environmentalist,” he declared on the shore of Lake Erie, the first stop on a five-state environmental tour that would take him to Boston Harbor, Dukakis’s home turf. “Those who think we are powerless to do anything about the greenhouse effect,” he said, “are forgetting about the White House effect.”

His running mate emphasized the ticket’s commitment to the issue at the vice-presidential debate. “The greenhouse effect is an important environmental issue,” Dan Quayle said. “We need to get on with it. And in a George Bush administration, you can bet that we will.”

This kind of talk roused the oil-and-gas men. “A lot of people on the Hill see the greenhouse effect as the issue of the 1990s,” a gas lobbyist told Oil & Gas Journal. Before a meeting of oil executives shortly after the “environmentalist” candidate won the election, Representative Dick Cheney, a Wyoming Republican, warned, “It’s going to be very difficult to fend off some kind of gasoline tax.” The coal industry, which had the most to lose from restrictions on carbon emissions, had moved beyond denial to resignation. A spokesman for the National Coal Association acknowledged that the greenhouse effect was no longer “an emerging issue. It is here already, and we’ll be hearing more and more about it.”

By the end of the year, 32 climate bills had been introduced in Congress, led by Wirth’s omnibus National Energy Policy Act of 1988. Co-sponsored by 13 Democrats and five Republicans, it established as a national goal an “International Global Agreement on the Atmosphere by 1992,” ordered the Energy Department to submit to Congress a plan to reduce energy use by at least 2 percent a year through 2005 and directed the Congressional Budget Office to calculate the feasibility of a carbon tax. A lawyer for the Senate energy committee told an industry journal that lawmakers were “frightened” by the issue and predicted that Congress would eventually pass significant legislation after Bush took office

The other great powers refused to wait. The German Parliament created a special commission on climate change, which concluded that action had to be taken immediately, “irrespective of any need for further research,” and that the Toronto goal was inadequate; it recommended a 30 percent reduction of carbon emissions

Margaret Thatcher, who had studied chemistry at Oxford, warned in a speech to the Royal Society that global warming could “greatly exceed the capacity of our natural habitat to cope” and that “the health of the economy and the health of our environment are totally dependent upon each other.”

The prime ministers of Canada and Norway called for a binding international treaty on the atmosphere; Sweden’s Parliament went further, announcing a national strategy to stabilize emissions at the 1988 level and eventually imposing a carbon tax

the United Nations unanimously endorsed the establishment, by the World Meteorological Organization and the United Nations Environment Program, of an Intergovernmental Panel on Climate Change, composed of scientists and policymakers, to conduct scientific assessments and develop global climate policy.

One of the I.P.C.C.’s first sessions to plan an international treaty was hosted by the State Department, 10 days after Bush’s inauguration. James Baker chose the occasion to make his first speech as secretary of state. “We can probably not afford to wait until all of the uncertainties about global climate change have been resolved,” he said. “Time will not make the problem go away.”

: On April 14, 1989, a bipartisan group of 24 senators, led by the majority leader, George Mitchell, requested that Bush cut emissions in the United States even before the I.P.C.C.’s working group made its recommendation. “We cannot afford the long lead times associated with a comprehensive global agreement,” the senators wrote. Bush had promised to combat the greenhouse effect with the White House effect. The self-proclaimed environmentalist was now seated in the Oval Office. It was time.

8. ‘You Never Beat The White House’ April 1989

After Jim Baker gave his boisterous address to the I.P.C.C. working group at the State Department, he received a visit from John Sununu, Bush’s chief of staff. Leave the science to the scientists, Sununu told Baker. Stay clear of this greenhouse-effect nonsense. You don’t know what you’re talking about. Baker, who had served as Reagan’s chief of staff, didn’t speak about the subject again.

despite his reputation as a political wolf, he still thought of himself as a scientist — an “old engineer,” as he was fond of putting it, having earned a Ph.D. in mechanical engineering from M.I.T. decades earlier. He lacked the reflexive deference that so many of his political generation reserved for the class of elite government scientists.

Since World War II, he believed, conspiratorial forces had used the imprimatur of scientific knowledge to advance an “anti-growth” doctrine. He reserved particular disdain for Paul Ehrlich’s “The Population Bomb,” which prophesied that hundreds of millions of people would starve to death if the world took no step to curb population growth; the Club of Rome, an organization of European scientists, heads of state and economists, which similarly warned that the world would run out of natural resources; and as recently as the mid-’70s, the hypothesis advanced by some of the nation’s most celebrated scientists — including Carl Sagan, Stephen Schneider and Ichtiaque Rasool — that a new ice age was dawning, thanks to the proliferation of man-made aerosols. All were theories of questionable scientific merit, portending vast, authoritarian remedies to halt economic progress.

When Mead talked about “far-reaching” decisions and “long-term consequences,” Sununu heard the marching of jackboots.

Sununu had suspected that the greenhouse effect belonged to this nefarious cabal since 1975, when the anthropologist Margaret Mead convened a symposium on the subject at the National Institute of Environmental Health Sciences.

While Sununu and Darman reviewed Hansen’s statements, the E.P.A. administrator, William K. Reilly, took a new proposal to the White House. The next meeting of the I.P.C.C.’s working group was scheduled for Geneva the following month, in May; it was the perfect occasion, Reilly argued, to take a stronger stand on climate change. Bush should demand a global treaty to reduce carbon emissions.

Sununu wouldn’t budge. He ordered the American delegates not to make any commitment in Geneva. Very soon after that, someone leaked the exchange to the press.

A deputy of Jim Baker pulled Reilly aside. He said he had a message from Baker, who had observed Reilly’s infighting with Sununu. “In the long run,” the deputy warned Reilly, “you never beat the White House.”

9. ‘A Form of Science Fraud’ May 1989

The cameras followed Hansen and Gore into the marbled hallway. Hansen insisted that he wanted to focus on the science. Gore focused on the politics. “I think they’re scared of the truth,” he said. “They’re scared that Hansen and the other scientists are right and that some dramatic policy changes are going to be needed, and they don’t want to face up to it.”

The censorship did more to publicize Hansen’s testimony and the dangers of global warming than anything he could have possibly said. At the White House briefing later that morning, Press Secretary Marlin Fitzwater admitted that Hansen’s statement had been changed. He blamed an official “five levels down from the top” and promised that there would be no retaliation. Hansen, he added, was “an outstanding and distinguished scientist” and was “doing a great job.”

10. The White House Effect Fall 1989

The Los Angeles Times called the censorship “an outrageous assault.” The Chicago Tribune said it was the beginning of “a cold war on global warming,” and The New York Times warned that the White House’s “heavy-handed intervention sends the signal that Washington wants to go slow on addressing the greenhouse problem.”

Darman went to see Sununu. He didn’t like being accused of censoring scientists. They needed to issue some kind of response. Sununu called Reilly to ask if he had any ideas. We could start, Reilly said, by recommitting to a global climate treaty. The United States was the only Western nation on record as opposing negotiations.

Sununu sent a telegram to Geneva endorsing a plan “to develop full international consensus on necessary steps to prepare for a formal treaty-negotiating process. The scope and importance of this issue are so great that it is essential for the U.S. to exercise leadership.”

Sununu seethed at any mention of the subject. He had taken it upon himself to study more deeply the greenhouse effect; he would have a rudimentary, one-dimensional general circulation model installed on his personal desktop computer. He decided that the models promoted by Jim Hansen were a lot of bunk. They were horribly imprecise in scale and underestimated the ocean’s ability to mitigate warming. Sununu complained about Hansen to D. Allan Bromley, a nuclear physicist from Yale who, at Sununu’s recommendation, was named Bush’s science adviser. Hansen’s findings were “technical poppycock” that didn’t begin to justify such wild-eyed pronouncements that “the greenhouse effect is here” or that the 1988 heat waves could be attributed to global warming, let alone serve as the basis for national economic policy.

When a junior staff member in the Energy Department, in a meeting at the White House with Sununu and Reilly, mentioned an initiative to reduce fossil-fuel use, Sununu interrupted her. “Why in the world would you need to reduce fossil-fuel use?” he asked. “Because of climate change,” the young woman replied. “I don’t want anyone in this administration without a scientific background using ‘climate change’ or ‘global warming’ ever again,” he said. “If you don’t have a technical basis for policy, don’t run around making decisions on the basis of newspaper headlines.” After the meeting, Reilly caught up to the staff member in the hallway. She was shaken. Don’t take it personally, Reilly told her. Sununu might have been looking at you, but that was directed at me.

Reilly, for his part, didn’t entirely blame Sununu for Bush’s indecision on the prospect of a climate treaty. The president had never taken a vigorous interest in global warming and was mainly briefed about it by nonscientists. Bush had brought up the subject on the campaign trail, in his speech about the White House effect, after leafing through a briefing booklet for a new issue that might generate some positive press. When Reilly tried in person to persuade him to take action, Bush deferred to Sununu and Baker. Why don’t the three of you work it out, he said. Let me know when you decide

Relations between Sununu and Reilly became openly adversarial. Reilly, Sununu thought, was a creature of the environmental lobby. He was trying to impress his friends at the E.P.A. without having a basic grasp of the science himself.

Pomerance had the sinking feeling that the momentum of the previous year was beginning to flag. The censoring of Hansen’s testimony and the inexplicably strident opposition from John Sununu were ominous signs. So were the findings of a report Pomerance had commissioned, published in September by the World Resources Institute, tracking global greenhouse-gas emissions. The United States was the largest contributor by far, producing nearly a quarter of the world’s carbon emissions, and its contribution was growing faster than that of every other country. Bush’s indecision, or perhaps inattention, had already managed to delay the negotiation of a global climate treaty until 1990 at the earliest, perhaps even 1991. By then, Pomerance worried, it would be too late.

Pomerance tried to be more diplomatic. “The president made a commitment to the American people to deal with global warming,” he told The Washington Post, “and he hasn’t followed it up.” He didn’t want to sound defeated. “There are some good building blocks here,” Pomerance said, and he meant it. The Montreal Protocol on CFCs wasn’t perfect at first, either — it had huge loopholes and weak restrictions. Once in place, however, the restrictions could be tightened. Perhaps the same could happen with climate change. Perhaps. Pomerance was not one for pessimism. As William Reilly told reporters, dutifully defending the official position forced upon him, it was the first time that the United States had formally endorsed the concept of an emissions limit. Pomerance wanted to believe that this was progress.

All week in Noordwijk, Becker couldn’t stop talking about what he had seen in Zeeland. After a flood in 1953, when the sea swallowed much of the region, killing more than 2,000 people, the Dutch began to build the Delta Works, a vast concrete-and-steel fortress of movable barriers, dams and sluice gates — a masterpiece of human engineering. The whole system could be locked into place within 90 minutes, defending the land against storm surge. It reduced the country’s exposure to the sea by 700 kilometers, Becker explained. The United States coastline was about 153,000 kilometers long. How long, he asked, was the entire terrestrial coastline? Because the whole world was going to need this. In Zeeland, he said, he had seen the future.

Ken Caldeira, a climate scientist at the Carnegie Institution for Science in Stanford, Calif., has a habit of asking new graduate students to name the largest fundamental breakthrough in climate physics since 1979. It’s a trick question. There has been no breakthrough. As with any mature scientific discipline, there is only refinement. The computer models grow more precise; the regional analyses sharpen; estimates solidify into observational data. Where there have been inaccuracies, they have tended to be in the direction of understatement.

More carbon has been released into the atmosphere since the final day of the Noordwijk conference, Nov. 7, 1989, than in the entire history of civilization preceding it

Despite every action taken since the Charney report — the billions of dollars invested in research, the nonbinding treaties, the investments in renewable energy — the only number that counts, the total quantity of global greenhouse gas emitted per year, has continued its inexorable rise.

When it comes to our own nation, which has failed to make any binding commitments whatsoever, the dominant narrative for the last quarter century has concerned the efforts of the fossil-fuel industries to suppress science, confuse public knowledge and bribe politicians.

The mustache-twirling depravity of these campaigns has left the impression that the oil-and-gas industry always operated thus; while the Exxon scientists and American Petroleum Institute clerics of the ’70s and ’80s were hardly good Samaritans, they did not start multimillion-dollar disinformation campaigns, pay scientists to distort the truth or try to brainwash children in elementary schools, as their successors would.

It was James Hansen’s testimony before Congress in 1988 that, for the first time since the “Changing Climate” report, made oil-and-gas executives begin to consider the issue’s potential to hurt their profits. Exxon, as ever, led the field. Six weeks after Hansen’s testimony, Exxon’s manager of science and strategy development, Duane LeVine, prepared an internal strategy paper urging the company to “emphasize the uncertainty in scientific conclusions.” This shortly became the default position of the entire sector. LeVine, it so happened, served as chairman of the global petroleum industry’s Working Group on Global Climate Change, created the same year, which adopted Exxon’s position as its own

The American Petroleum Institute, after holding a series of internal briefings on the subject in the fall and winter of 1988, including one for the chief executives of the dozen or so largest oil companies, took a similar, if slightly more diplomatic, line. It set aside money for carbon-dioxide policy — about $100,000, a fraction of the millions it was spending on the health effects of benzene, but enough to establish a lobbying organization called, in an admirable flourish of newspeak, the Global Climate Coalition.

The G.C.C. was conceived as a reactive body, to share news of any proposed regulations, but on a whim, it added a press campaign, to be coordinated mainly by the A.P.I. It gave briefings to politicians known to be friendly to the industry and approached scientists who professed skepticism about global warming. The A.P.I.’s payment for an original op-ed was $2,000.

It was joined by the U.S. Chamber of Commerce and 14 other trade associations, including those representing the coal, electric-grid and automobile industries

In October 1989, scientists allied with the G.C.C. began to be quoted in national publications, giving an issue that lacked controversy a convenient fulcrum. “Many respected scientists say the available evidence doesn’t warrant the doomsday warnings,” was the caveat that began to appear in articles on climate change.

The following year, when President Bill Clinton proposed an energy tax in the hope of meeting the goals of the Rio treaty, the A.P.I. invested $1.8 million in a G.C.C. disinformation campaign. Senate Democrats from oil-and-coal states joined Republicans to defeat the tax proposal, which later contributed to the Republicans’ rout of Democrats in the midterm congressional elections in 1994 — the first time the Republican Party had won control of both houses in 40 years

The G.C.C. spent $13 million on a single ad campaign intended to weaken support for the 1997 Kyoto Protocol, which committed its parties to reducing greenhouse-gas emissions by 5 percent relative to 1990 levels. The Senate, which would have had to ratify the agreement, took a pre-emptive vote declaring its opposition; the resolution passed 95-0. There has never been another serious effort to negotiate a binding global climate treaty.

. This has made the corporation an especially vulnerable target for the wave of compensatory litigation that began in earnest in the last three years and may last a generation. Tort lawsuits have become possible only in recent years, as scientists have begun more precisely to attribute regional effects to global emission levels. This is one subfield of climate science that has advanced significantly sin

Pomerance had not been among the 400 delegates invited to Noordwijk. But together with three young activists — Daniel Becker of the Sierra Club, Alden Meyer of the Union of Concerned Scientists and Stewart Boyle from Friends of the Earth — he had formed his own impromptu delegation. Their constituency, they liked to say, was the climate itself. Their mission was to pressure the delegates to include in the final conference statement, which would be used as the basis for a global treaty, the target proposed in Toronto: a 20 percent reduction of greenhouse-gas combustion by 2005. It was the only measure that mattered, the amount of emissions reductions, and the Toronto number was the strongest global target yet proposed.

The delegations would review the progress made by the I.P.C.C. and decide whether to endorse a framework for a global treaty. There was a general sense among the delegates that they would, at minimum, agree to the target proposed by the host, the Dutch environmental minister, more modest than the Toronto number: a freezing of greenhouse-gas emissions at 1990 levels by 2000. Some believed that if the meeting was a success, it would encourage the I.P.C.C. to accelerate its negotiations and reach a decision about a treaty sooner. But at the very least, the world’s environmental ministers should sign a statement endorsing a hard, binding target of emissions reductions. The mood among the delegates was electric, nearly giddy — after more than a decade of fruitless international meetings, they could finally sign an agreement that meant something.

11. ‘The Skunks at The Garden Party’ November 1989

It was nearly freezing — Nov. 6, 1989, on the coast of the North Sea in the Dutch resort town of Noordwijk

Losing Earth: The Decade WeAlmost Stopped Climate Change We knew everything we needed to know, and nothing stood in our way. Nothing, that is, except ourselves. A tragedy in two acts. By Nathaniel RichPhotographs and Videos by George Steinmetz AUG. 1, 2018

The biggest factor making this kind of climate initiative possible, after so many years of inaction, is the spectacular technological progress in renewable energy that has taken place since 2009 or so. This means that we can greatly reduce emissions using carrots instead of sticks: giving people incentives to use low-emission technologies rather than trying to regulate or tax them into giving up high-emission activities.

the politics of carrots are obviously a lot easier than the politics of sticks.

Above all, real G.D.P. says nothing about how stuff is produced. A kilowatt-hour of electricity counts the same whether it was generated by burning coal or wind power, but the environmental impact is completely different.

So let’s talk about why such claims are all wrong.

many people don’t understand what economic growth means, imagining that it necessarily involves producing the same things you were producing before, in the same ways, but just at a larger scale.

But that’s not at all what growth means. Currently, America’s real gross domestic product is about a third larger than it was in 2007. But the economy of 2023 isn’t just the economy of 2007 scaled up by a third. Production of some goods has gone way down — coal production has been cut roughly in half.

at this precise moment — the most hopeful moment for the environment, as far as I can tell, in decades — my inbox has been filling up with woeful claims that environmental protection is incompatible with economic growth. These claims are oddly bipartisan. Some of them come from people on the left who insist that the planet can’t be saved unless we give up on the notion of perpetual economic growth. Others come from people on the right who insist that we must give up on all this environmentalism if we want to preserve prosperity.

In fact, environmental quality is often better in rich countries, with high G.D.P. per capita, than in middle-income countries

As a result, there’s no reason a growing economy must place an increasing burden on the environment.

the environmental Kuznets curve.

, a comparison between the New York metropolitan area and Delhi, India. Delhi has a larger population but a much smaller G.D.P. So does New York’s big economy mean a highly stressed environment?

how does air quality in the two cities compare? As anyone who’s visited both places knows, New York air is, well, relatively OK, while Delhi air … isn’t.

at higher levels of development, delinking growth from environmental impact isn’t just possible in principle but something that happens a lot in practice.

Here’s a favorite chart of mine from the invaluable Our World in Data website. It shows carbon dioxide emissions per capita in Britain, where the Industrial Revolution began. The early phases of industrialization were indeed associated with a huge rise in emissions. But more recently emissions have fallen back to the levels of the ’50s — the 1850s:

How did Britain do that? Part of the answer is that over time the British economy switched from relying on coal to relying on hydrocarbons, which when burned generate less carbon dioxide. Britain also learned to use energy more efficiently over time. But more recently a big factor has been the rise of renewable energy, especially, in Britain’s case, wind power

So when you hear an environmentalist say something like, “We live on a finite planet, so we can’t have unlimited economic growth,” what they’re actually revealing is that they don’t understand what economic growth means

in practice, they’re lending aid and comfort to anti-environmentalists, who want us to believe that protecting the environment is incompatible with rising living standards.

That said, while it’s possible to decouple growth from environmental harm, that’s not automatic. To combine rising living standards with an improving environment, we need policies that encourage the use of technologies that cause less environmental damage.

The good news is that the United States is finally implementing such policies. Still, we need a lot more action along those lines — not just in America but in the rest of the world. So we can do this — but we need to try, and not give in to counsels of despair.

Socially, the booming fast fashion industry is often built on low wages paid to women working in factories abroad but also increasingly in the UK

In the UK, we buy more clothes per person than any other country in Europe – five times what we bought in the 1980s, which creates 1.3m tonnes of waste each year, some 350,000 tonnes of which is dumped in landfill or incinerated.

Yet despite the overwhelming evidence gathered by the environmental audit committee (EAC), ministers this week rejected every recommendation for tackling abuses across the fashion industry, including a ban on incinerating or landfilling stock that can be recycled and a 1p charge on each garment to raise £35m a year for better clothing collection and sorting, a move supported by many in the industry.

But the response of the government was met with anger by many within the industry, where ethical fashion firms come up against others who produce at lower costs on the back of exploitative wage structures and environmentally damaging production models

“It is a vastly damaging industry that has been spiralling unchecked for far too long. The Earth and the people on it are exploited and damaged at every single step of the chain, and this culminates with unimaginable mountains of unused excess stock or badly made broken waste clothing with nowhere to go other than landfill or incineration.”

But others are less sure that voluntary measures will tackle what they say is a systemic power imbalance between brands and manufacturers, which leads to worker exploitation, or address the enormous environmental footprint of their trade.

Commit to wearing every piece 30 times. If we doubled the amount of time we kept clothes for, we would cut our fashion emissions by 44%.

“So who is accountable for water and chemical pollution abroad, precarious work and employment, the undercutting of compliant manufacturers, the pollution from delivery and lack of recycling at home? Brands might find it difficult to make £5 fast fashion dresses and be socially and environmentally sustainable.

Ways to take the environmental heat out of your fashion habit

“The fundamental problem with much of fast fashion is that its social and environmental costs are not taken into account. The environmental costs of materials and fabric are mostly offshored. The production that takes place in the UK often only pays half the legal minimum wage.

Get smart about fibres. Cheap cotton and synthetics come with huge environmental footprints. Cotton uses unsustainable amounts of water and pesticide. Go for hemp blended with organic cotton and silk and lyocel/modal.

Treat cotton as a luxury fibre. Buy products certified as organic to be free of the pesticide burden and plan to keep them for years.

Wash clothes less often. The average laundry cycle releases hundreds of thousands of tiny fragments of plastic from synthetic fibres into waterways. Put jeans in the freezer and remove dirt when frozen. Fleeces have been shown to release the most plastic fibres

Delete shopping apps from your phone and swear off insta-shopping for fashion. Go shopping for clothes in a shop.

f dry cleaning is a must, use an eco-friendly process: conventional dry cleaning harms the soil, air and wate

I had other doubts, too. It seemed hubristic, or worse, to make multitrillion-dollar policy bets based on computer models trying to forecast climate patterns decades into the future. Climate activists kept promoting policies based on technologies that were either far from mature (solar energy) or sometimes actively harmful (biofuels).

Expensive efforts to curb greenhouse gas emissions in Europe and North America seemed particularly fruitless when China, India and other developing countries weren’t about to curb their own appetite for fossil fuels

just how fast is Greenland’s ice melting right now? Is this an emergency for our time, or is it a problem for the future?

His pitch was simple: The coastline we have taken for granted for thousands of years of human history changed rapidly in the past on account of natural forces — and would soon be changing rapidly and disastrously by man-made ones. A trip to Greenland, which holds one-eighth of the world’s ice on land (most of the rest is in Antarctica) would show me just how drastic those changes have been. Would I join him?

Greenland is about the size of Alaska and California combined and, except at its coasts, is covered by ice that in places is nearly two miles thick. Even that’s only a fraction of the ice in Antarctica, which is more than six times as large

Greenland’s ice also poses a nearer-term risk because it is melting faster. If all its ice were to melt, global sea levels would rise by some 24 feet. That would be more than enough to inundate hundreds of coastal cities in scores of nations, from Jakarta and Bangkok to Copenhagen and Amsterdam to Miami and New Orleans.

There was also a millenarian fervor that bothered me about climate activism, with its apocalyptic imagery (the Statue of Liberty underwater) and threats of doom unless we were willing to live far more frugally.

“We haven’t had a good positive mass balance year since the late 1990s,” he told me in a follow-on email when I asked him to explain the data for me. The losses can vary sharply by year. The annualized average over the past 30 years, he added, is 170 gigatons per year. That’s the equivalent of about 5,400 tons of ice loss per second. That “suggests that Greenland ice loss has been tracking the I.P.P.C. worse-case, highest-carbon-emission scenario.

The data shows unmistakably that Greenland’s ice is not in balance. It is losing far more than it is gaining.

scientists have been drilling ice-core samples from Greenland for decades, giving them a very good idea of climatic changes stretching back thousands of years. Better yet, a pair of satellites that detect anomalies in Earth’s gravity fields have been taking measurements of the sheet regularly for nearly 20 years, giving scientists a much more precise idea of what is happening.

it’s hard to forecast with any precision what that means. “Anyone who says they know what the sea level is going to be in 2100 is giving you an educated guess,” said NASA’s Willis. “The fact is, we’re seeing these big ice sheets melt for the first time in history, and we don’t really know how fast they can go.”

His own educated guess: “By 2100, we are probably looking at more than a foot or two and hopefully less than seven or eight feet. But we are struggling to figure out just how fast the ice sheets can melt. So the upper end of range is still not well known.”

On the face of it, that sounds manageable. Even if sea levels rise by eight feet, won’t the world have nearly 80 years to come to grips with the problem, during which technologies that help us mitigate the effects of climate change while adapting to its consequences are likely to make dramatic advances?

Won’t the world — including countries that today are poor — become far richer and thus more capable of weathering the floods, surges and superstorms?

The average rate at which sea level is rising around the world, he estimates, has more than tripled over the past three decades, to five millimeters a year from 1.5 millimeters. That may still seem minute, yet as the world learned during the pandemic, exponential increases have a way of hitting hard.

“When something is on a straight line or a smooth curve, you can plot its trajectory,” Englander said. “But sea level, like earthquakes and mudslides, is something that happens irregularly and can change rather quickly and surprise us. The point is, you can no longer predict the future by the recent past.”

In The Wall Street Journal’s editorial pages, where I used to work, the theoretical physicist Steven Koonin, a former under secretary for science in the Obama administration’s Energy Department, cast doubt on the threat from Thwaites in a voice that could have once been mine. He also thinks the risks associated with Greenland’s melting are less a product of human-induced global warming than of natural cycles in North Atlantic currents and temperatures, which over time have a way of regressing to the mean.

Even the poorest countries, while still unacceptably vulnerable, are suffering far fewer human and economic losses to climate-related disasters.