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Revelle and his colleagues got the green light, and by the fall of 1965 they produced the first official report to any government anywhere on the possible threat to humanity from rising CO2 levels. On November 6, Lyndon Johnson became the first president to mention the threat in a message to Congress.

Our own global-warming “phony war” is over. The hot war is here.

But we failed the moment. One year later, largely preoccupied with the war in Vietnam, the president grew distracted, budgets for other priorities were squeezed, and the nation was fast polarizing. We flunked that first chance to confront global warming

the powers in New York resisted. Through the rest of 1939 and into the spring of 1940, Hitler hunched on the borders of France and the Low Countries, his Panzers idling, poised to strike. Shirer fumed, “My God! Here was the old continent on the brink of war…and the network was most reluctant to provide five minutes a day from here to report it.” Just as the networks and cable channels provide practically no coverage today of global warming.

President Johnson urged us to circulate the report widely throughout the government and to the public, despite its controversial emphasis on the need for “economic incentives” to discourage pollution, including—shudder!—taxes levied against polluters. (You can go online to “Restoring the Quality of Our Environment—1965,” and read the entire 23-page section, headlined Appendix Y4—Atmospheric Carbon Dioxide.)

The networks put their reporters out in raincoats or standing behind police barriers as flames consume far hills. Yet we rarely hear the words “global warming” or “climate disruption” in their reports. The big backstory of rising CO2 levels, escalating drought, collateral damage, cause and effect, and politicians on the take from fossil-fuel companies? Forget all that. Not good for ratings, say network executives

But last October, the UN Intergovernmental Panel on Climate Change, a scientifically conservative body, gave us 12 years to make massive changes to reduce global greenhouse-gas emissions 45 percent below 2010 levels and to net zero by 2050

On his indispensable site, TomDispatch.com, Tom Engelhardt writes that humanity is now on a suicide watch.

Here’s the good news: While describing David Wallace-Wells’s stunning new book The Uninhabitable Earth as a remorseless, near-unbearable account of what we are doing to our planet, The New York Times reports it also offers hope. Wallace-Wells says that “We have all the tools we need…to aggressively phase out dirty energy…; [cut] global emissions…[and] scrub carbon from the atmosphere…. [There are] ‘obvious’ and ‘available,’ [if costly,] solutions.” What we need, he adds, is the “acceptance of responsibility.”

Late 1940. The start of the Blitz, with bombs blasting London to bits. A Gallup poll that September found that a mere 16 percent of Americans supported sending US aid to beleaguered Britain. Olson and Cloud tell us that “One month later, as bombs fell on London, and Murrow and the Boys brought the reality of it into American living rooms, 52 percent thought more aid should be sent.”

With no silver bullet, what do we do? We cooperate as kindred spirits on a mission of public service. We create partnerships to share resources. We challenge media owners and investors to act in the public interest. We keep the whole picture in our heads—how melting ice sheets in the Arctic can create devastation in the Midwest—and connect the dots for our readers, viewers, and listeners

Warming can make wildfires worse, for example — it makes vegetation drier and more combustible — but forest management practices, as well as decisions about where to build, also affect the degree of devastation.

At the root of the changes is the basic process of global warming. As carbon dioxide and other greenhouse gases build up in the atmosphere, they trap more of the heat that radiates from Earth’s surface as it absorbs sunlight.

But the United States under President Trump is leaving the agreement, and a United Nations report last month suggested that even if countries meet their pledges to cut emissions, and many are far off track, warming would be more than twice the 1.5-degree target.

By some estimates, Arctic permafrost contains about twice as much carbon as is currently in the atmosphere.

When it thaws, the organic matter begins to decompose, and the carbon enters the atmosphere as methane or carbon dioxide, adding to warming

My boyfriend was supportive of my focus, but he didn’t share it. When I brought up global warming, he’d often try to comfort me: to wrap me in a hug, cue up an old episode of “Seinfeld,” offer a CBD gummy. I struggled to tell him that I didn’t need anesthesia or answers, I just wanted a relationship where we shared more of the same inquiries.

“if you do care about the same questions, it doesn’t necessarily matter if you arrive at the same answers.” Soon it wasn’t just the far-off future we’d stopped talking about, it was our dreams for the weekend. Outside of quarantine, our lives had slipped onto different rails. We broke up when it became easier not to talk about feelings at all.

relationships succeed not because you like holding hands but because you like looking in the same direction.

When another man told me he was looking for a woman with whom to visit places like Venice, in part because they were sinking into the sea, I didn’t know what to say except that I wasn’t her. As someone drawn to gray areas, I was put off by the guy who quipped that only “dumb” people were still having children.

If relationships depend on a shared fantasy of the future, then global warming does more than unsettle our environment; it creates uncertainty in our interpersonal ones.

I’ve started dating again. This time, I am swallowing my fear of sounding too anxious and am talking about climate change early on. After all, it is hard to fall in love with a person if we are not also falling in love with the future we want to create together.

I’ve found that talking about how global warming affects our lives, however casually, becomes a sort of canary in the coal mine for learning about people’s broader beliefs and behaviors. How black-and-white they see the world, how they view their role in the community, how they engage with science and systemic inequality.

I knew I wouldn’t mesh with the man who texted me “Life is better if you’re cheerful. I don’t read the news :)” but neither did I want to be with the one scheming up a walled compound of canned goods in Idaho.

She and my father had married while facing a horizon of stability. As middle-class white Americans, they saw a future of homeownership, health care and retirement funds

I don’t presume my own perspective is right, but I do know from my last relationship that I’m tired of trying to be chill. I can’t care any less than I do.

Chatting about climate change within the first few dates might not be standard yet, but the issue was the No. 1 concern for OkCupid daters in 2022, with a 368 percent increase in environmental and climate-change-related terms on profiles over the last five years

Tinder released a new campaign featuring a rendering of two people holding hands before a giant monster made of trash. “Someone to save the planet with,” it says.

I don’t think those daters just want a partner who believes in global warming: We want someone willing to grapple with it, to do the inconvenient work of reimagining our own lives in the face of it

It’s not just about when or whether to have a baby. Because global warming and pandemics go hand in hand — the progression of the first may increase the likelihood of the second — it seems likely that new long-term relationships could include both prolonged periods of staying inside and snap judgments about hitting the road.

I see now that it was not only conversations about our planet’s future that I struggled to have with my ex; it was conversations about our own future, too. It can be easy to feel as if the question of whether to have children, like rising sea levels, will be dealt with down the road.

But the future, as with the sea, does not obey its supposed bounds. If being alive right now sometimes feels like standing on a cliff, I want to be with someone who’s not afraid to peer at the frothing tides.

Not because I need to solve anything but because I don’t want a relationship built on looking away.

romantic relationships are not just distractions; they’re places for nourishment, bolstering us to face what’s outside the door.

only about 1 trillion tons of carbon can be burned and the resulting gas spewed into the atmosphere.

A panel of experts appointed by the United Nations, unveiling its latest assessment of climate research, reinforced its earlier conclusions that global warming is real, that it is caused primarily if not exclusively by human emissions, and that it is likely to get substantially worse unless efforts to limit those emissions are rapidly accelerated.

To keep using fossil fuels beyond the trillionth ton of emissions, companies would have to develop potentially expensive technology to capture carbon dioxide from emissions sources like power plants and store it underground.

But a considerable body of research suggests that in principle it could be done, and in the United States, the Obama administration is moving toward rules that would essentially require utilities to develop the technology if they want to keep burning coal to produce electricity. In response, the president’s Republican opponents have accused him of waging a “war on coal.”

The group has now issued five major reports, each of them finding greater certainty that the world is warming and greater likelihood that human activity is the principal cause. The new report finds a 95 to 100 percent chance that most of the warming of recent decades is human-caused, up from the 90 to 100 percent chance cited in the last report, in 2007.

The gas seemingly played a major role in amplifying the effects of the ice ages, which were caused by wobbles in the earth’s orbit. The geologic record suggests that as the earth began cooling, the amount of carbon dioxide fell, probably because much of it got locked up in the ocean, and that fall amplified the initial cooling. Conversely, when the orbital wobble caused the earth to begin warming, a great deal of carbon dioxide escaped from the ocean, amplifying the warming.

Their best estimate is that if the amount of carbon dioxide doubles, the temperature of the earth will rise about five or six degrees Fahrenheit. While that may sound small given the daily and seasonal variations in the weather, the number represents an annual global average, and therefore an immense addition of heat to the planet.

Moreover, scientists say that an increase of five or six degrees is a mildly optimistic outlook. They cannot rule out an increase as high as 18 degrees Fahrenheit, which would transform the planet.

Among the most prominent of these contrarians is Richard Lindzen of the Massachusetts Institute of Technology, who contends that as the earth initially warms, cloud patterns will shift in a way that should help to limit the heat buildup. Most climate scientists contend that little evidence supports this view,

China’s citizens, on average, still use less than a third of the energy per person as Americans. But with 1.3 billion people, four times as many as the United States, China is so large and is growing so quickly that it has surpassed the United States to become the world’s largest overall user of energy.

“When I go see things with my children, I let them know they might not be around when they’re older,” he said. “ ‘Go enjoy these beautiful forests before they disappear. Go enjoy the glaciers in these parks because they won’t be around.’ It’s basically taking note of what we have, and appreciating it, and saying goodbye to it.”

Business as usual is robbing people of hope, white-anting the promise of change

The message implicit in our governments’ refusal to act is that we should all just suck it up – as in “climate change is bullshit, and even if it’s not there’s nothing you can do about it”

It’s a licence for nihilism, a ticket to hell in a handbasket

the cohort responsible for this mixture of denial and fatalism is far removed from the daily experience of the ordinary citizen, especially the youngest and poorest of us. They have become a threat to our shared future and we must hold them to account, immediately and without reservation.

I’ve noticed a bruised attitude of beleaguerment in individuals and within groups that’s increasingly hard to ignore, a mounting grimness in the faces and language of people barely holding on in the face of steady, cumulative and unrelenting losses

some are clinging to the last tendrils of hope, others are falling into despair. And that worries me.

It’s expressed as grief, and the most palpable, widespread and immediate expression of it is now brewing over climate change. Beneath that grief there’s rage.

I worry that this widely-shared grief and unfocussed rage may become the signal human disposition of our time, that the Anthropocene will be marked by fury and hopelessness

Younger people in particular have begun to feel abandoned by their leaders and elders. They suspect they’ll be left without food or ammunition to stage a fighting retreat in which every battle is a defeat foreseen and every bit of territory was surrendered in advance by politicians and CEOs who deserted them long ago to hide in their privileged bunkers and silos

the reason humanity survived the cold war is because world leaders paid attention. They took emergent crises seriously. And in each instance of utmost danger, arguments of ideology and nationalism eventually fell away before the sacred importance of life itself

the four great capacities of humanity to solve a crisis – ingenuity, discipline, courage and sacrifice – these seem to be reserved for more important enterprises

Our governments and corporations are ensnared in a feedback loop of “common sense” and mutual self-preservation that’s little more than a bespoke form of nihilism. Ideology, prestige, assets and territory are now tacitly understood to be worth more than all life, human or otherwise

We can no longer wait patiently for our leaders to catch up. We cannot allow ourselves to be trained to accept hopelessness. Not by business, nor by governments. Both have subjected us to a steady diet of loss and depletion. It’s sapped us and left us mourning a future we can see fading before it even arrives

There’s no good reason to submit to this. No sane purpose in putting up with it. Because grief will paralyse us, and despair renders doom inevitable. We can afford neither.

we’ll need to get our house in order – and fast. That means calling bullshit on what’s been happening in our name for the past 15 years.

Life. It’s worth the fight. But, by God, after decades of appeasement, defeatism and denialism, it’s going to take a fight. Time’s short. So, let’s give our grief and fury some shape and purpose and reclaim our future together. Enough cowardice. Enough bullshit. Time for action.

The next president could go further and tell allies such as Germany, Japan and Canada that their status as major trading partners protected by the U.S. security umbrella is now contingent upon their making steep emissions cuts.

adaptation, which means preparing societies and their infrastructure for the effects of climate change, such as building flood walls to hold back higher sea levels or retrofitting buildings to withstand more severe heat waves.

Rich countries industrialized with fossil fuels, developing industries powered by coal, delivering fossil-fuel-based electricity and heat to homes, and building transportation systems that run on the internal-combustion engine. In following this path, these countries chewed through most of the planet’s “carbon budget” — the amount of greenhouse gas that could be spewed until global temperatures warmed by 2 degrees Celsius

The United States has contributed about 26 percent of the world’s cumulative emissions, and the 28 nations of the European Union are responsible for only slightly less.

if Americans had been restricted to emitting a proportional share of a global carbon budget that capped warming at 1.5 degrees, we would have blown through that limit in 1944.

Climate finance means foreign aid for three main purposes

mitigation: subsidies for renewable-energy deployment and storage, electrical-grid modernization, and other means of reducing emissions

In the Paris negotiations, developing nations were explicitly open to making more ambitious commitments if developed countries contributed to making them happen.

coverage for loss or damage: compensation for people whose homes become uninhabitable or whose livelihoods are destroyed by climate change.

“climate justice,” which also includes providing support to marginalized communities that are disproportionately affected by climate change in rich countries.

Last year, at a climate summit in Poland, India reiterated its openness to doing more if it were adequately subsidized, and an organization of the 47 least-developed nations echoed that plea.

Nobody knows how big the ultimate U.S. number will need to be; it depends on how many rich countries pitch in, and how much they give, and how much help poorer countries need to modernize in eco-friendly way

to stay below 2 degrees of warming, by 2030 the global economy needs to give a “green” makeover to the $5 trillion per year spent worldwide on sectors such as agriculture, energy, transportation, construction and heavy industry.

his may be toxic for American voters. Polls show that Americans overwhelmingly accept the science of climate change, are increasingly worried about it and in theory support the notion that the government should address it — but they are more divided in their willingness to actually pay for climate action

only 23 percent said they’d pay at least $40 per month to fight climate change

The United States may have a narrow opportunity to pay down some of its historical debts, stem the tide of future climate refugees and manage the political instability that extreme warming would cause. The last chance came in 2009-2010, but the Senate failed, in part thanks to Obama’s bungling of the negotiations, to pass even domestic climate legislation

The leaders of developing nations aren’t suckers, and they know how dire the problem is. They have something rich countries want (emissions reductions), and they’d be fools to just give it away for free, even if they could. If we want them to succeed, it’s going to cost us, and we’ll need to move quickly. The science is clear: We do not have another decade to waste.

Pompeo’s remarks were actually just the latest, loudest expression of the Trump climate doctrine: Yeah, the Earth is warming, but it’s too late to stop it, so we might as well quit bitching about it. Every melting glacier has a silver lining.

Pompeo uncorked a wild new talking point: Sure, climate change might have its downsides, but if we play our cards right, this thing can be great for trade!

But the administration had deployed this report not to underscore a call for environmental reforms, but to argue that a specific environmental regulation—fuel efficiency standards for new cars—be discontinued.

Republican voters have begun to wake up to the notion that huge corporations don’t always have the country’s best interests at heart, and that free markets aren’t necessarily the be-all and end-all of national economic policy that many previously insisted they were

Conservatives have soured on Facebook and Starbucks; less so on ExxonMobil. Funny how that works.

Still, we should do something. We need to learn how much, if at all, we can influence emissions.

Politics is present-oriented.

Most nations aren’t willing to scrap the energy status quo — the very basis of modern civilization — before having a practical substitute

That’s a standard carbon tax. What defines the “carbon dividend” plan is that all the money collected would be rebated to households.

a “carbon dividend” plan. This would be a good start.

Under one proposal, the government would slap a $43 tax on each ton of CO2. That would equal about 38 cents on a gallon of gasoline

It would raise about $180 billion in the tax’s first year, he says. If the “dividend” — the tax rebate — were distributed evenly, that would be about $1,400 per household.

Without the tax, projected CO2 emissions would be 5.4 billion metric tons in 2035. With the tax, the total would be 3.6 billion metric tons, a 33 percent decline

the initial increase in gasoline prices of 38 cents a gallon is within normal market fluctuations. The rebate would sweeten the tax. Consumers who cut fossil fuel use would come out ahead.

The tax has another advantage. It decentralizes decision-making to individual companies and people

None of this has changed my long-standing skepticism that, without some major technological breakthrough (safer nuclear power?), it will be exceedingly hard to halt the increase in atmospheric concentrations of greenhouse gases. The required changes in lifestyle and economic activity are simply too great.

The poll by The Post and Kaiser Family Foundation (KFF) is the first major survey of teenagers’ views since the explosion of the youth climate movement last year.

This week, in the run-up to a major United Nations summit, hundreds of thousands of school kids plan to abandon their classrooms to demand more aggressive measures to protect the planet.

“People feel very guilty when a child says, ‘You are stealing my future.’ That has impact,” Thunberg told The Post. “We have definitely made people open their eyes.”

More than 7 in 10 teenagers and young adults say climate change will cause a moderate or great deal of harm to people in their generation,

Both Lopez and Graham said thinking about climate change makes them afraid, an emotion they share with 57 percent of teens nationwide. Fewer than a third of teens say they are optimistic.

most say they rarely or never discuss the issue with family and friends.

Adults “think: ‘Oh you’re so young, you don’t know what you’re talking about,’” he said. “But I know the facts, and I know what the most drastic consequences will be. I know that people aren’t doing what needs to be done.”

Roughly a third of both teenagers and adults say the issue is “extremely important” to them personally

Just under half believe the United States must drastically reduce its fossil fuel use in the next few years to avoid the worst effects of climate change.

Adults, he said, don’t seem to take the issue as seriously, or as personally, as people his age

Teenagers also share adults’ questions and misconceptions about the ways the world is warming. In both age groups, no more than 2 in 10 say they know “a lot” about the causes of climate change and ways to reduce it

fewer than half say they’ve taken action to reduce their own carbon footprints

nd roughly 4 in 10 say mitigating the effects of warming will require major sacrifices from ordinary Americans.

the number of teenagers who say they’re being taught in school how to mitigate climate change appears to be on the decline

Fourteen percent say they have learned “a lot” about the subject, down from 25 percent in 2010

“It’s terrible,” said Sam Riley, 17, of Boston. “It’s hardly ever brought up at my school.”

The high school junior said he learned nearly everything he knows about climate change from reading the news and searching the Internet

Riley, who is black, believes that minorities and people in low income communities will be most severely impacted by warming, because they are more likely to live in vulnerable areas and less likely to be able to insulate themselves.“The wealthier you are, the more protection you have,”

black and Hispanic teens express a greater sense of urgency around climate change; 37 percent and 41 percent, respectively, say people need to act in the next year or two, compared with 24 percent of white teens.

About 4 in 10 of those under 18 call climate change a “crisis.” But unlike adults, most teenagers say they don’t feel helpless. More than half — 54 percent — say they feel motivated.

But,” she said, “this generation — we’re fighters. And we’re going to win.”

The Earth itself is our greatest ally in this effort. Ecosystems like California’s kelp forests absorb about half of the greenhouse gases humans emit, studies show. Without them, warming would be even worse. Nature shields us from the worst consequences of our own actions, forgiving the sins we refuse to repent.

If we hope to solve climate change, humanity must also address this biodiversity crisis — restoring ecosystems and the creatures that inhabit them.

One way to revitalize ecosystems: protect the ground they grow from.Think of the soft, spongy soil of an old-growth woodland. Here, a towering oak tree draws up water and nutrients via threadlike fungi attached to its roots. In exchange, the fungi take sugar from the oak, funneling carbon from the air into the ground.Now imagine a leaf from that oak drifting slowly to the forest floor. Perhaps it becomes food for an earthworm. Then microbes attack the earthworm’s droppings, breaking down the residue further still.Eventually, the carbon that was once a leaf can become trapped in clods of earth. Other atoms may form strong chemical bonds with minerals like iron, which prevents them from reacting with oxygen and returning to the air. Under the right conditions, carbon might stay locked away in dense, dark earth for centuries. Soils contain more carbon than the entire atmosphere and all the world’s plants combined.

This makes soil both a ticking time bomb and an overlooked climate solution

“And because soil is such an important reservoir,” Berhe said, “a small change in the release of that carbon can lead to a big change in the concentrations of greenhouse gases in the atmosphere.”

A 2020 analysis in the journal Nature Sustainability found that better soil stewardship could reduce emissions by at least 5.5 gigatons of carbon dioxide each year — about 15 percent of current annual emissions.

“Once that happens,” Berhe said, “it’s not just the carbon status of the soil that’s improved. The soil literally becomes softer. It holds more water and nutrients. It’s easier for plants to grow in … and serve as a home for the most abundant and diverse group of organisms that we know of.

Enhancing carbon in soils is just the beginning. In 2017, an international team of scientists set out to determine how much carbon the planet could pull out of the atmosphere, if humans would only give it a chance. In a study in the Proceedings of the National Academy of Sciences (PNAS), they concluded natural climate systems are capable of storing almost 24 gigatons of carbon dioxide per year — roughly two thirds of what people emit.

About half of that sequestration would be cost-effective, meaning enacting the necessary protections would cost less than the consequences of keeping that carbon in the air.

Of the climate solutions they studied, few delivered more carbon bang per buck than mangroves — lush systems of salt-tolerant shrubs and trees that thrive where freshwater rivers spill into the sea. Though these forests occupy just 0.5 percent of the Earth’s shorelines, they account for 10 percent of the coast’s carbon storage capacity.

But the unique ecosystems are too often dismissed as unproductive swamps, good for no one but the mosquitoes. In the past half-century, more than a quarter of the world’s mangroves have been destroyed — drained for development, converted for shrimp farms, poisoned by fertilizer and drowned by dammed-up streams.

Yet the Earth cannot compensate for all of humanity’s pollution, said William Schlesinger, former dean of Duke University’s School of the Environment and a co-author on the 2017 PNAS study. Unless people also reduce the amount of greenhouse gases we emit, no amount of ecological restoration will save us.

“The bottom line is we’ve got to get off of using fossil fuels in transportation and heating and lighting and everything else,”

In public talks, he puts it this way: “It’s easier to patch a hole in a bag than to pick up the marbles that fall out.”

Since the end of the last ice age, the frozen expanse at the top of the world has acted as a protective shield. During the summer, when the sun shines 24 hours a day, Arctic sea ice reflects about two-thirds of the light that hits it back into space. By contrast, the dark open ocean absorbs the majority of the sun’s heat.

If the Arctic loses its perpetual ice cover, it would add half a degree Celsius of warming to the global average temperature, studies suggest. The world is hurtling toward that milestone. Since 1979, the volume of ice left at the end of the summer has shrunk about 75 percent.

There is just one way to save it, she said: by stopping global warming. Only by ending the use of fossil fuels and eliminating greenhouse gas emissions can people prevent the Arctic from heating further and give the ice a chance to recover.

If we do nothing, models indicate, it will be a matter of decades before the summertime Arctic is ice-free for the first time in human history. Sea levels will surge, coastal communities will be deluged, and we will no longer have the planet’s air conditioning unit to help us cool our world down.

Our species evolved and our civilization was built under fairly stable climate conditions. When things changed, they changed slowly, giving us time to adapt.

The rapid transformation of our planet doesn’t just endanger ecosystems; humanity will suffer. People have never lived on a planet without mangroves, or peatlands, or summertime ice. We’ve never had to go without the benefits the Earth provides.

The goal of the Paris climate accord is to keep the increase in global temperatures well below 2 degrees Celsius compared with pre-industrial levels, and ideally try to limit warming to 1.5 degrees Celsius. Those thresholds refer to temperature on Earth over multiple years. Exceeding 1.5 degrees Celsius of warming in a single year wouldn't breach the Paris Agreement. But with every passing year of rising greenhouse gas emissions, it becomes more and more likely that humans will cause catastrophic warming. The report estimates there's a 90% chance that one of the next five years will be the warmest year on record.

Carbon capture and storage, which Morgan Stanley says is the only viable option for reducing emissions from coal-fired plants, is another key area and would need almost $2.5 trillion of investment.

to reduce net carbon emissions to zero and meet the Paris Agreement’s goal, the world would have to eliminate 53.5 billion metric tons of carbon dioxide each year,

Beyond the social and environmental consequences from failing to act on climate change, going beyond a temperature rise of 2 degrees Celsius could result in a loss of $10 trillion to $20 trillion of global GDP by 2100, Morgan Stanley predicts.

Within the electric vehicles space, Tesla is the “only pure play”—though they should be followed by VW and Toyota in the long run, while other companies like Panasonic and Albemarle are among the leading players in lithium technology and supply.

For hydrogen, companies to watch include Air Liquide, Siemens and Alstom.

Conversations about climate change have broken into everyday life, to the top of the headlines and to center stage in the presidential campaign.

The questions are profound and urgent. Can this be reversed? What can be done to minimize the looming dangers for the decades ahead? Will the destruction of recent weeks become a moment of reckoning, or just a blip in the news cycle?

“It’s as if we’ve been smoking a pack of cigarettes a day for decades” and the world is now feeling the effects

But, she said, “we’re not dead yet.”

Climate change is more a slope than a cliff, experts agreed. We’re still far from any sort of “game over” moment where it’s too late to act. There remains much that can be done to limit the damage to come, to brace against the coming megafires and superstorms and save lives and hold onto a thriving civilization.

The effects of climate change evident today are the results of choices that countries made decades ago to keep pumping heat-trapping greenhouse gases into the atmosphere at ever-increasing rates despite warnings from scientists about the price to be paid.

Nations, including the United States, have dithered so long in cutting emissions that progressively more global warming is assured for decades to come, even if efforts to shift away from fossil fuels were accelerated tomorrow.

Things are on track to get “twice as bad” as they are now, he said, “if not worse.”

it may be time to flip that chronological framing, and consider today the new starting point.

“Don’t think of it as the warmest month of August in California in the last century,” he wrote. “Think of it as one of the coolest months of August in California in the next century.”

Their most sobering message was that the world still hasn’t seen the worst of it. Gone is the climate of yesteryear, and there’s no going back.

“It’s not that it’s out of our control. The whole thing is in our control.”

Managing climate change, experts said, will require rethinking virtually every aspect of daily life

how and where homes are built, how power grids are designed, how people plan for the future with the collective good in mind.

It will require an epochal shift in politics in a country that has, on the whole, ignored climate change

The fires, along with others in places including Colorado, Oregon and Washington, destroyed entire towns and sent smoke tens of thousands of feet high. San Francisco, Portland and Seattle have suffered some of the unhealthiest air quality on the planet, beating cities such as Beijing and New Delhi for the title. Smoke spread all the way across the continent, with particles coloring sunsets on the East Coast.

Evidence of global warming — which, scientists said, helps drive a rise in wildfire activity by creating hotter and drier conditions — was hanging visibly in the air.

For a long time, “there was so much focus on how climate change would affect the most vulnerable, like low-lying island nations or coral reefs — things that don’t dramatically affect the economic powerhouses of the world,”

“There’s often been this arrogant assumption that wealth provides protection.”

“we’re all in this together.”

Again and again, climate scientists have shown that our choices now range from merely awful to incomprehensibly horrible.

every coal plant in China, every steel mill in Europe, every car and truck in the United States.

It’s a staggering task. It means reorienting a global economy that depends on fossil fuels

Even if we start radically slashing emissions today, it could be decades before those changes start to appreciably slow the rate at which Earth is warming. In the meantime, we’ll have to deal with effects that continue to worsen.

“Seriously, it is not reversible.”

First, experts broadly agreed, if we want to stop the planet from relentlessly heating up forever, humanity will quickly need to eliminate its emissions of planet-warming greenhouse gases.

Whether Americans can adopt that mentality remains an open question.“We’ve often heard the argument that it will be too expensive to cut emissions and it will just be easier to adapt,” said Noah Diffenbaugh, a climate scientist at Stanford University. But we’ve now had decades of warnings, he said, “and we’re not even adapted to the present climate.”

Failure to do so doubles or triples that number.

If we act now, sea levels could rise another 1 to 2 feet this century.

If we don’t, Antarctica’s ice sheets could destabilize irreversibly and ocean levels could keep rising at an inexorable pace for centuries, making coastal civilization all but unmanageable.

The best hope is to slow the pace of warming enough to maintain some control for humanity.

“In our research, we’ve found that most systems can cope with a 1.5-degree or 2-degree world, although it will be very costly and extremely difficult to adapt

“But in a 4-degree world, in many cases, the system just doesn’t work anymore.”

So, even as nations cut emissions, they will need to accelerate efforts to adapt to the climate change they can no longer avoid.

“The human capacity for adaptation is extraordinary — not unlimited, but extraordinary,”

“I’m much more concerned for the future of the nonhuman than I am for the future of humans, precisely because we’re just very, very good at adaptation.”

adaptation is usually a reactive measure, not a preventive one

Adapting to climate change means envisioning bigger disasters to come — again, flipping the framing away from history and into the future.

“Humans have difficulty imagining things that we haven’t experienced yet,”

It’s hard to visualize the entire West Coast aflame until you actually see it. And if we can’t see it, we tend to discount the risk.”

And there’s the moral hazard problem, which is when people are shielded from the costs of their decisions and thus make bad ones.

Cascading Disasters

Adaptation can quickly become bogged down in a tangle of competing motivations and unintended consequences.

Proposals for stricter building codes or higher insurance premiums face opposition from builders and voters alike.

If we cut emissions rapidly, about one-seventh of the world’s population will suffer severe heat waves every few years.

as climate change intensifies, it increases the risk of “compound hazards,” when numerous disasters strike simultaneously, as well as the risk that one disaster cascades into another.

Experts also noted that climate change is an accelerant of inequality. Those most affected, globally and in the United States, tend to be the most vulnerable populations.

One concern is that adaptability will not be a collective effort. Wealthier people may find ways to protect themselves, while others are left fending for themselves

A Lifetime of Clues

For well over a century, science has provided us with powerful clues that this was coming.

As early as the 1850s, researchers realized that greenhouse gases like carbon dioxide could trap heat on Earth. This came at the dawn of the Industrial Age,

“I feel like the climate scientists have kind of done our job,” said Dr. Kalmus, the Los Angeles-based scientist. “We’ve laid it out pretty clearly, but nobody’s doing anything. So now it’s kind of up to the social scientists.”

ne 2017 study found that people who experience extreme weather are more likely to support climate adaptation measures than before. But the effect diminished over time. It may be that people mentally adjust to unusual weather patterns, updating their perception of what they consider normal.

“There’s too much complexity and, frankly, too much that needs to be changed, that we’re flitting from one concern to another,”

“What’s beautiful about the human species is that we have the free will to decide our own fate,” said Ilona Otto, a climate scientist at the Wegener Center for Climate and Global Change. “We have the agency to take courageous decisions and do what’s needed,” she said. “If we choose.”

Climate scientists generally agree that the Atlantic circulation will decline this century, but there’s no consensus on whether it will stall out before 2100.

the new findings were reason enough not to regard a shutdown as an abstract, far-off concern. “It’s now,” she said.

As humans warm the atmosphere, however, the melting of the Greenland ice sheet is adding large amounts of fresh water to the North Atlantic, which could be disrupting the balance of heat and salinity that keeps the overturning moving. A patch of the Atlantic south of Greenland has cooled conspicuously in recent years, creating a “cold blob” that some scientists see as a sign that the system is slowing.

Abrupt thawing of the Arctic permafrost. Loss of the Amazon rain forest. Collapse of the Greenland and West Antarctic ice sheets. Once the world warms past a certain point, these and other events could be set into swift motion, scientists warn, though the exact thresholds at which this would occur are still highly uncertain.

In the Atlantic, researchers have been searching for harbingers of tipping-point-like change in a tangle of ocean currents that goes by an unlovely name: the Atlantic Meridional Overturning Circulation, or AMOC (pronounced “AY-mock”).

These currents carry warm waters from the tropics through the Gulf Stream, past the southeastern United States, before bending toward northern Europe. When this water releases its heat into the air farther north, it becomes colder and denser, causing it to sink to the deep ocean and move back toward the Equator. This sinking effect, or “overturning,” allows the currents to transfer enormous amounts of heat around the planet, making them hugely influential for the climate around the Atlantic and beyond.

adds to a growing body of scientific work that describes how humankind’s continued emissions of heat-trapping gases could set off climate “tipping points,” or rapid and hard-to-reverse changes in the environment.

Much of the Northern Hemisphere could cool. The coastlines of North America and Europe could see faster sea-level rise. Northern Europe could experience stormier winters, while the Sahel in Africa and the monsoon regions of Asia would most likely get less rain.

Scientists’ uncertainty about the timing of an AMOC collapse shouldn’t be taken as an excuse for not reducing greenhouse-gas emissions to try to avoid it, said Hali Kilbourne, an associate research professor at the University of Maryland Center for Environmental Science.

scientists’ most advanced computer models of the global climate have produced a wide range of predictions for how the currents might behave in the coming decades, in part because the mix of factors that shape them is so complex.

Dr. Ditlevsen’s new analysis focused on a simple metric, based on sea-surface temperatures, that is similar to ones other scientists have used as proxies for the strength of the Atlantic circulation. She conducted the analysis with Peter Ditlevsen, her brother, who is a climate scientist at the University of Copenhagen’s Niels Bohr Institute. They used data on their proxy measure from 1870 to 2020 to calculate statistical indicators that presage changes in the overturning.

“Not only do we see an increase in these indicators,” Peter Ditlevsen said, “but we see an increase which is consistent with this approaching a tipping point.”

They then used the mathematical properties of a tipping-point-like system to extrapolate from these trends. That led them to predict that the Atlantic circulation could collapse around midcentury, though it could potentially occur as soon as 2025 and as late as 2095.

Their analysis included no specific assumptions about how much greenhouse-gas emissions will rise in this century. It assumed only that the forces bringing about an AMOC collapse would continue at an unchanging pace — essentially, that atmospheric carbon dioxide concentrations would keep rising as they have since the Industrial Revolution.

they voiced reservations about some of its methods, and said more work was still needed to nail down the timing with greater certainty.

Susan Lozier, a physical oceanographer at Georgia Tech, said sea-surface temperatures in the North Atlantic near Greenland weren’t necessarily influenced by changes in the overturning alone, making them a questionable proxy for inferring those changes. She pointed to a study published last year showing that much of the cold blob’s development could be explained by shifts in wind and atmospheric patterns.

Scientists are now using sensors slung across the Atlantic to directly measure the overturning. Dr. Lozier is involved in one of these measurement efforts. The aim is to better understand what’s driving the changes beneath the waves, and to improve projections of future changes.

Still, the new study sent an urgent message about the need to keep collecting data on the changing ocean currents,

Were the circulation to tip into a much weaker state, the effects on the climate would be far-reaching, though scientists are still examining their potential magnitude.

“It is very plausible that we’ve fallen off a cliff already and don’t know it,” Dr. Kilbourne said. “I fear, honestly, that by the time any of this is settled science, it’s way too late to act.”

Whichever way you cut it, global warming is already happening too fast to generously support life, which our prior climate did quite well. As a feebly supportive climate devolves into an unsupportive one, it won’t matter who forecasted the timing right, only that we missed our chance at the good version of Earth.

The scientist James Hansen, famous for his early warnings about climate change, suggested in a paper released last week with a suite of high-level colleagues that warming is accelerating more rapidly than is presently understood: In their view, that the Earth could exceed 1.5 degrees of warming this decade is practically assured, and 2 degrees by 2050 is likely unless the world eliminates fossil-fuel use far faster than planned.

One expert who worked on the UN report called this “insanity,” a “climate disaster of our own making.” The climate math is not adding up.

the loss of much of West Antarctica’s ice sheet is now virtually inevitable. Even if future emissions are drastically curtailed, enough warming is probably locked in to wash the bulk of the sheet away. At best, she says, we are on the brink of its total loss becoming assured

by one estimate, the West Antarctic ice sheet contains enough water to raise sea level globally by just over five meters, or 17 feet. At the very least, Naughten told me, she thinks it would be wise to plan for two to three meters of sea-level rise, or six to ten feet, in the next couple of centuries

I shudder to think what would happen if everyone living within two meters of sea level would be displaced,” she added. That “everyone” is projected to include some 410 million by 2100.

Previous studies have warned of the ice sheet’s collapse if emissions were not drawn down; hers now suggests that we’ve passed the point of no return, that even significant emissions cuts would be too late for this particular ice sheet. (The East Antarctic ice sheet, she said, is far more stable—and good thing, because it contains enough frozen water for 10 times the amount of sea-level rise as its western counterpart.

France, Ireland, Kenya, Spain, and 12 other countries have called for a global accord to phase out fossil-fuel production. There is little doubt that this is necessary; adding more fossil fuels to the pipeline is quite obviously counterproductive to slowing, then stopping, climate change.

Yet in the U.S. alone, a country responsible for at least 20 percent of historical emissions, the current buildout of liquified-natural-gas infrastructure, intended to export the country’s plentiful gas, is the largest fossil-fuel expansion proposed in the world—and it’s happening under a president who recently passed the most impactful climate legislation the country has ever seen

China, which is responsible for about 12 percent of historical emissions according to Alex Wang, who studies Chinese environmental governance at UCLA, has one of the largest clean-power programs in the world. But the country is at the same time dramatically expanding its coal production.

the difference between the world we have and the one we could have is buried in two contrasting modeling reports by two of the world’s most important energy-information organizations.

Whereas the International Energy Agency projected that we’d hit peak fossil-fuel use in 2030, the U.S. Energy Information Administration came to a very different conclusion: It saw demand for fossil fuels rising through at least 2050

If a policy is set to expire, the U.S. EIA treats it as expiring. It doesn’t take into account policies that countries have talked about but have had yet to implement. The international agency’s analysis, in contrast, assumes countries will follow through with more climate-friendly policies and renew the ones they already have on the books. “Look how different things could be,” Bowman said. The difference is night and day, despair and hope.

Policy, and only policy, appears to make that difference. It represents the choices that our leaders make about when to finally change course.

“climate is a spectrum; it isn’t an on/off switch.” Whenever we do make a different set of decisions, ones that make the math properly compute, we will be saving what we have left, preventing some layer of livability from being irrecoverably sloughed off and swept away.

Before this study, continuous temperature record reconstruction only went back about 2,000 years. The temperature trend produces a line shaped like a "hockey stick" with a sudden spike after what had been a fairly steady line. That data came from tree rings, ice cores and lake sediments.

the general downward trend of temperatures that reversed 100 years ago seemed to indicate the Earth was heading either toward another ice age or little ice age from about 1550 to 1850. Or it was continuing to cool naturally until greenhouse gases from the burning of fossil fuels changed everything.

"We have, through human emissions of carbon dioxide and other heat-trapping gases, indefinitely delayed the onset of the next ice age and are now heading into an unknown future where humans control the thermostat of the planet,

Sets a goal to reduce carbon pollution by at least 3 billion metric tons cumulatively by 2030 – more than half of the annual carbon pollution from the U.S. energy sector

Makes up to $8 billion in loan guarantee authority available for a wide array of advanced fossil energy and efficiency projects to support investments in innovative technologies;

Directs EPA to work closely with states, industry and other stakeholder to establish carbon pollution standards for both new and existing power plants;

expanding and prioritizing forest- and rangeland-restoration efforts to make areas less vulnerable to catastrophic fire;

Commits to expand major new and existing international initiatives, including bilateral initiatives with China, India, and other major emitting countries;

calling for the end of U.S. government support for public financing of new coal-fired powers plants overseas, except for the most efficient coal technology available in the world’s poorest countries, or facilities deploying carbon capture and sequestration technologies;

Our foundation of Earth knowledge, largely derived from historically observed patterns, has been central to society’s progress. Early cultures kept track of nature’s ebb and flow, passing improved knowledge about hunting and agriculture to each new generation. Science has accelerated this learning process through advanced observation methods and pattern discovery techniques. These allow us to anticipate the future with a consistency unimaginable to our ancestors.

But as Earth warms, our historical understanding will turn obsolete faster than we can replace it with new knowledge. Some patterns will change significantly; others will be largely unaffected

The list of possible disruptions is long and alarming.

Historians of the next century will grasp the importance of this decline in our ability to predict the future. They may mark the coming decades of this century as the period during which humanity, despite rapid technological and scientific advances, achieved “peak knowledge” about the planet it occupies

One exception to this pattern-based knowledge is the weather, whose underlying physics governs how the atmosphere moves and adjusts. Because we understand the physics, we can replicate the atmosphere with computer models.

But farmers need to think a season or more ahead. So do infrastructure planners as they design new energy and water systems

The intermediate time period is our big challenge. Without substantial scientific breakthroughs, we will remain reliant on pattern-based methods for time periods between a month and a decade. The problem is, as the planet warms, these patterns will become increasingly difficult to discern.

The oceans, which play a major role in global weather patterns, will also see substantial changes as global temperatures rise. Ocean currents and circulation patterns evolve on time scales of decades and longer, and fisheries change in response. We lack reliable, physics-based models to tell us how this occurs.

Our grandchildren could grow up knowing less about the planet than we do today. This is not a legacy we want to leave them. Yet we are on the verge of ensuring this happens.