Group items tagged

One target is to give protected status to sites important for biodiversity -- covering at least 30% of these land and sea areas by 2030, with at least 10% under "strict protection." Another target is to cut pollution from biocides, plastic wastes, and excess nutrients by at least 50%.

For years, scientists have warned that we are in the midst of a mass extinction -- the sixth in the planet's history, and the first one caused by humans.

We have wrecked the world's natural ecosystems -- almost 600 plant species have been wiped out in the past 250 years, an extinction rate 500 times faster than it would have been without human intervention. The plants' mass extinction spell trouble for the millions of species -- including humans -- that depend upon them.

But the population boom won't end anytime soon. The draft plan released Monday warned that the current world population of 7.6 billion is expected to reach 8.6 billion by 2030 and 9.8 billion by 2050 -- with severe "implications for the demand for resources, including food, infrastructure and land use."

Biodiversity is defined as the variety of living organisms,

The biologist EO Wilson once described this loss as a “hidden and immense” tragedy, overshadowed by the threat of climate change.

decimates habitats through drainage and pollution.

Native island populations are particularly susceptible, with the dodo in Mauritius and the flying fox on Guam, poignant examples.

likely to climb the ranks as a driver of extinction.

nailed-on candidates for extinction.

as seen with some of the world’s fisheries.

humans driving species to extinction for the last 60,000 years

Aichi Biodiversity Targets and Sustainable Development Goals.

wasps in New Zealand and cane toads in Australia.

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.

but we should not let the momentum of what had been hailed as a “super year” for the environment be lost.

We are in an age of extinction and at the point where irreversible environmental damage could be wrought. Despite changed plans, we cannot afford to lose pace nor focus. The challenge of the biodiversity and climate crises will still be there when the Covid-19 restrictions are lifted; the ambition of

Some improvements in pollution levels have been seen in countries with restricted movements of people and the shutdown of factories and businesses. Will we be able to balance our need for these to reopen and our desire to travel while reducing the footprint of these kinds of activities?

A poster to mark the first Earth Day featured the quote: “We have met the enemy and he is us.” Fifty years on, will this be the year we collectively stop taking the planet for granted, degrading and exploiting its resources? Will we now, also, realise how vulnerable a species we actually are?

At the end of the year, we will still have a decade to deliver the sustainable development goals, and the biodiversity and climate change COPs – along with other key international meetings – will be rescheduled.

Crucially, a window of opportunity is opening to ensure that economic recovery plans that countries adopt as they emerge from this crisis are steadfastly “green”. Long-term investment and sustainable economic growth plans should drive climate projects and environmental change. We need nature more than ever, as a solution, as a resource, for respite and for life on Earth.

Looking ahead, there are opportunities emerging from this pandemic which, if seized, could set the path for a more fruitful 2021 “super year”. We must cease being the enemy of nature, and instead become its friend.

until now, the planet’s natural defense systems were better at fighting them off.

Today, climate warming is demolishing those defense systems, driving a catastrophic loss in biodiversity that, when coupled with reckless deforestation and aggressive conversion of wildland for economic development, pushes farms and people closer to the wild and opens the gates for the spread of disease.

ignoring how climate and rapid land development were putting disease-carrying animals in a squeeze was akin to playing Russian roulette.

the virus is believed to have originated with the horseshoe bat, part of a genus that’s been roaming the forests of the planet for 40 million years and thrives in the remote jungles of south China, even that remains uncertain.

China for years and warning that swift climate and environmental change there — in both loss of biodiversity and encroachment by civilization — was going to help new viruses jump to people.

. Roughly 60% of new pathogens come from animals — including those pressured by diversity loss — and roughly one-third of those can be directly attributed to changes in human land use, meaning deforestation, the introduction of farming, development or resource extraction in otherwise natural settings

Vector-borne diseases — those carried by insects like mosquitoes and ticks and transferred in the blood of infected people — are also on the rise as warming weather and erratic precipitation vastly expand the geographic regions vulnerable to contagion.

Climate is even bringing old viruses back from the dead, thawing zombie contagions like the anthrax released from a frozen reindeer in 2016, which can come down from the arctic and haunt us from the past.

It is demonstrating in real time the enormous and undeniable power that nature has over civilization and even over its politics.

it also makes clear that climate policy today is indivisible from efforts to prevent new infectious outbreaks, or, as Bernstein put it, the notion that climate and health and environmental policy might not be related is “a ​dangerous delusion.”

The warming of the climate is one of the principal drivers of the greatest — and fastest — loss of species diversity in the history of the planet, as shifting climate patterns force species to change habitats, push them into new regions or threaten their food and water supplies

What’s known as biodiversity is critical because the natural variety of plants and animals lends each species greater resiliency against threat and together offers a delicately balanced safety net for natural systems

As diversity wanes, the balance is upset, and remaining species are both more vulnerable to human influences and, according to a landmark 2010 study in the journal Nature, more likely to pass along powerful pathogens.

even incremental and seemingly manageable injuries to local environments — say, the construction of a livestock farm adjacent to stressed natural forest — can add up to outsized consequences.

Coronaviruses like COVID-19 aren’t likely to be carried by insects — they don’t leave enough infected virus cells in the blood. But one in five other viruses transmitted from animals to people are vector-borne

the number of species on the planet has already dropped by 20% and that more than a million animal and plant species now face extinction.

Americans have been experiencing this phenomenon directly in recent years as migratory birds have become less diverse and the threat posed by West Nile encephalitis has spread. It turns out that the birds that host the disease happen to also be the tough ones that prevail amid a thinned population

as larger mammals suffer declines at the hands of hunters or loggers or shifting climate patterns, smaller species, including bats, rats and other rodents, are thriving, either because they are more resilient to the degraded environment or they are able to live better among people.

It is these small animals, the ones that manage to find food in garbage cans or build nests in the eaves of buildings, that are proving most adaptable to human interference and also happen to spread disease.

Warmer temperatures and higher rainfall associated with climate change — coupled with the loss of predators — are bound to make the rodent problem worse, with calamitous implications.

As much as weather changes can drive changes in species, so does altering the landscape for new farms and new cities. In fact, researchers attribute a full 30% of emerging contagion to what they call “land use change.”

As the global population surges to 10 billion over the next 35 years, and the capacity to farm food is stressed further again by the warming climate, the demand for land will only get more intense.

Already, more than one-third of the planet’s land surface, and three-quarters of all of its fresh water, go toward the cultivation of crops and raising of livestock. These are the places where infectious diseases spread most often.

The U.S. Centers for Disease Control and Prevention says that fully three-quarters of all new viruses have emerged from animals

Almost every major epidemic we know of over the past couple of decades — SARS, COVID-19, Ebola and Nipah virus — jumped to people from wildlife enduring extreme climate and habitat strain, and still, “we’re naive to them,” she said. “That puts us in a dangerous place.”

A 2008 study in the journal Nature found nearly one-third of emerging infectious diseases over the past 10 years were vector-borne, and that the jumps matched unusual changes in the climate

Ticks and mosquitoes now thrive in places they’d never ventured before. As tropical species move northward, they are bringing dangerous pathogens with them.

by 2050, disease-carrying mosquitoes will ultimately reach 500 million more people than they do today, including some 55 million more Americans.

In 2013, dengue fever — an affliction affecting nearly 400 million people a year, but normally associated with the poorest regions of Africa — was transmitted locally in New York for the first time.

“The long-term risk from dengue may be much higher than COVID,

only 15% of the planet’s forests remain intact. The rest have been cut down, degraded or fragmented to the point that they disrupt the natural ecosystems that depend on them.

it’s only a matter of time before other exotic animal-driven pathogens are driven from the forests of the global tropics to the United States or Canada or Europe because of the warming climate.

it will also shape how easily we get sick. According to a 2013 study in the journal PLOS Currents Influenza, warm winters were predictors of the most severe flu seasons in the following year

Even harsh swings from hot to cold, or sudden storms — exactly the kinds of climate-induced patterns we’re already seeing — make people more likely to get sick.

The chance of a flu epidemic in America’s most populated cities will increase by as much as 50% this century, and flu-related deaths in Europe could also jump by 50%.

Slow action on climate has made dramatic warming and large-scale environmental changes inevitable, he said, “and I think that increases in disease are going to come along with it.”

By late 2018, epidemiologists there were bracing for what they call “spillover,” or the failure to keep a virus locally contained as it jumped from the bats and villages of Yunnan into the wider world.

In late 2018, the Trump administration, as part of a sweeping effort to bring U.S. programs in China to a halt, abruptly shut down the research — and its efforts to intercept the spread of a new novel coronavirus along with it. “We got a cease and desist,” said Dennis Carroll, who founded the PREDICT program and has been instrumental in global work to address the risks from emerging viruses. By late 2019, USAID had cut the program’s global funding.

The loss is immense. The researchers believed they were on the cusp of a breakthrough, racing to sequence the genes of the coronaviruses they’d extracted from the horseshoe bat and to begin work on vaccines.

They’d campaigned for years for policymakers to fully consider what they’d learned about how land development and climate changes were driving the spread of disease, and they thought their research could literally provide governments a map to the hot spots most likely to spawn the next pandemic.

They also hoped the genetic material they’d collected could lead to a vaccine not just for one lethal variation of COVID, but perhaps — like a missile defense shield for the biosphere — to address a whole family of viruses at once

Carroll said knowledge of the virus genomes had the potential “to totally transform how we think about future biomedical interventions before there’s an emergence.

PREDICT’s staff and advisers have pushed the U.S. government to consider how welding public health policy with environmental and climate science could help stem the spread of contagions.

Since Donald Trump was elected, the group hasn’t been invited back.

What Daszak really wants — in addition to restored funding to continue his work — is the public and leaders to understand that it’s human behavior driving the rise in disease, just as it drives the climate crisis

“We turn a blind eye to the fact that our behavior is driving this,” he said. “We get cheap goods through Walmart, and then we pay for it forever through the rise in pandemics. It’s upside down.”

Growing evidence points to a connection between destructive environmental practices and emerging diseases.

Of more than 330 diseases which emerged between 1940 and 2004, nearly two-thirds were zoonotic, meaning they were transmitted from animals to humans, as with, for example, HIV/AIDS and probably covid-19.

over 70% originated in wildlife,

Replacing old-growth forests with a single crop, such as oil palm, can also lead to the transmission of disease. If predators’ habitats are destroyed and their populations dwindle, other creatures such as rodents, mosquitoes, bats and some primates can proliferate.

scientists are increasingly turning their attention to how altering land interferes with a pathogen’s journey from animals to humans

felling trees increases contact between humans and disease-carrying animals

correlation between the loss of forests in west and central Africa and outbreaks of Ebola between 2004 and 2014

Cutting down trees may also increase the threat to humans posed by viral infections transmitted through mosquito bites, such as Zika, dengue and chikungunya.

link between changes in global forest cover between 1990 and 2016 and an increase in reported epidemics, even accounting for the fact that deforestation usually means more humans living nearby

Wildlife may also move towards human settlements in search of food. Mango trees planted on pig farms in Malaysia probably attracted fruit bats carrying nipah, a virus that infected local pig farmers in 1999 and still breaks out yearly in Bangladesh.

bruise, brown, wilt, oxidize, ding, or discolor and that is apparently something American shoppers will not abide. For an American family of four, the average value of discarded produce is nearly $1,600 annually

(Globally, the United Nations Food and Agriculture Organization estimates that one-third of all food grown is lost or wasted, an amount valued at nearly $3 trillion. )

“Grocery stores routinely trash produce for being the wrong shape or containing minor blemishes,

“Vast quantities of fresh produce grown in the U.S. are left in the field to rot, fed to livestock or hauled directly from the field to landfill, because of unrealistic and unyielding cosmetic standards.”

“In my mind, the desire for perfect produce came about in the 1940s as housewives adapted to widespread refrigeration and new CPG [consumer packaged goods] products,”

Perfection and manicured foods came to represent safety and new technology.

this obsession might become amplified in an era of high foodie-ism and Instagram where a sort of heirloom airbrushing has taken hold. Writing in The Times in 2014, Pete Wells christened the extension of this phenomenon in restaurants as “camera cuisine,”

in the last year, ‘foodies’ and chefs have catapulted the issue of food waste into popular conversations,” she adds, naming initiatives by chefs and public intellectuals such as Dan Barber and Roy Choi as well as the pu pu platter of coverage of the issue in elite food magazines.

start-ups like the Bay Area’s Imperfect Produce are starting to deliver ugly but otherwise consumable goods at a discount

France has banned supermarkets from throwing away food by directing them to compost or donate all expiring or unsold food.

Germany is focusing on the issue in part by reforming expiration dates, which many argue are arbitrary and problematic.

“My hope is that as food education proliferates, so will an appreciation for ugly fruits and veggies, biodiversity, local crops, and so much more, all of which can help mitigate food waste,”

“Wouldn't it be neat if the power of Instagram was used to share recipes for carrot top pesto and food scrap stock? Or if we had easy-to-use apps for sharing extra produce with neighbors or food pantries? Both ideas I've already seen foodies fiddling with.”

it faces the same daunting task that confronted Carl Bosch a century ago: How much can it bring costs down? And how fast can it scale up

They believe that over the next seven years they can bring expenses down to a level that would enable them to sell CO₂ into more lucrative markets. Air-captured CO₂ can be combined with hydrogen and then fashioned into any kind of fossil-fuel substitute you want. Instead of making bread from air, you can make fuels from air.

What Gebald and Wurzbacher really want to do is to pull vast amounts of CO₂ out of the atmosphere and bury it, forever, deep underground, and sell that service as an offset

companies like Climeworks face a quandary: How do you sell something that never existed before, something that may never be cheap, into a market that is not yet real?

It’s arguably the case, in fact, that when it comes to reducing our carbon emissions, direct air capture will be seen as an option that’s too expensive and too modest in impact. “The only way that direct air capture becomes meaningful is if we do all the other things we need to do promptly,” Hal Harvey, a California energy analyst who studies climate-friendly technologies and policies, told me

In short, the best way to start making progress toward a decarbonized world is not to rev up millions of air capture machines right now. It’s to stop putting CO₂ in the atmosphere in the first place.

If the nations of the world were to continue on the current track, it would be impossible to meet the objectives of the 2016 Paris Agreement, which set a goal limiting warming to 2 degrees Celsius or, ideally, 1.5 degrees. And it would usher in a world of misery and economic hardship. Already, temperatures in some regions have climbed more than 1 degree Celsius, as a report by the Intergovernmental Panel on Climate Change noted last October. These temperature increases have led to an increase in droughts, heat waves, floods and biodiversity losses and make the chaos of 2 or 3 degrees’ additional warming seem inconceivable

A further problem is that maintaining today’s emissions path for too long runs the risk of doing irreparable damage to the earth’s ecosystems — causing harm that no amount of technological innovation can make right. “There is no reverse gear for natural systems,” Harvey says. “If they go, they go. If we defrost the tundra, it’s game over.” The same might be said for the Greenland and West Antarctic ice sheets, or our coral reefs. Such resources have an asymmetry in their natural architectures: They can take thousands or millions of years to form, but could reach conditions of catastrophic decline in just a few decades.

To have a shot at maintaining a climate suitable for humans, the world’s nations most likely have to reduce CO₂ emissions drastically from the current level — to perhaps 15 billion or 20 billion metric tons per year by 2030; then, through some kind of unprecedented political and industrial effort, we need to bring carbon emissions to zero by around 2050

To preserve a livable environment we may also need to extract CO₂ from the atmosphere. As Wurzbacher put it, “if you take all these numbers from the I.P.C.C., you end up with something like eight to 10 billion tons — gigatons — of CO₂ that need to be removed from the air every year, if we are serious about 1.5 or 2 degrees.

Through photosynthesis, our forests take extraordinary amounts of carbon dioxide from the atmosphere, and if we were to magnify efforts to reforest clear-cut areas — or plant new groves, a process known as afforestation — we could absorb billions more metric tons of carbon in future years.

we could grow crops specifically to absorb CO₂ and then burn them for power generation, with the intention of capturing the power-plant emissions and pumping them underground, a process known as bioenergy with carbon capture and storage, or BECCS

Ever since the Industrial Revolution, human societies have produced an excess of CO₂, by taking carbon stores from deep inside the earth — in the form of coal, oil and gas — and from stores aboveground (mostly wood), then putting it into the atmosphere by burning it. It has become imperative to reverse the process — that is, take CO₂ out of the air and either restore it deep inside the earth or contain it within new surface ecosystems.

“It’s not about saying, ‘I want to plant a tree.’ It’s about saying, ‘We want to plant a billion trees.’

“We have to come to grips with the fact that we waited too long and that we took some options off the table,” Michael Oppenheimer, a Princeton scientist who studies climate and policy, told me. As a result, NETs no longer seem to be just interesting ideas; they look like necessities. And as it happens, the Climeworks machines on the rooftop do the work each year of about 36,000 trees.

air capture could likewise help counter the impact of several vital industries. “There are process emissions that come from producing iron and steel, cement and glass,” she says, “and any time you make these materials, there’s a chemical reaction that emits CO₂.” Direct air capture could even lessen the impacts of the Haber-Bosch processes for making fertilizer; by some estimates, that industry now accounts for 3 percent of all CO₂ emissions.

Wind and solar are now the cheapest forms of energy in the right locations,” Pacala says. “The return on those investments, if you calculated it, would blow the doors off anything in your portfolio. It’s like investing in early Apple. So it’s a spectacular story of success. And direct air capture is precisely the same kind of problem, in which the only barrier is that it’s too costly.”

what all the founders have in common is a belief that the cost of capturing a ton of carbon will soon drop sharply.

M.I.T.’s Howard Herzog, for instance, an engineer who has spent years looking at the potential for these machines, told me that he thinks the costs will remain between $600 and $1,000 per metric ton

He points out that because direct-air-capture machines have to move tremendous amounts of air through a filter or solution to glean a ton of CO₂ — the gas, for all its global impact, makes up only about 0.04 percent of our atmosphere — the process necessitates large expenditures for energy and big equipment. What he has likewise observed, in analyzing similar industries that separate gases, suggests that translating spreadsheet projections for capturing CO₂ into real-world applications will reveal hidden costs. “I think there has been a lot of hype about this, and it’s not going to revolutionize anything,

Climeworks’s current goal is to remove 1 percent of the world’s annual CO₂ emissions by the mid 2020s.

“Basically, we have a road map — $600, down to $400, down to $300 and $200 a ton,” Wurzbacher said. “This is over the next five years. Down to $200 we know quite well what we’re doing.” And beyond $200, Wurzbacher suggested, things get murkier.

To actually capture 1 percent of the world’s carbon emissions by 2025 would, by Gebald’s calculations, require that Climeworks build 250,000 carbon-capture plants like the ones on the roof at Hinwil. That adds up to about 4.5 million carbon collectors

The Climeworks founders therefore try to think of their product as the automotive industry might — a piece of mass-produced technology and metal, not the carbon they hope to sequester.

“Every CO₂ collector has about the same weight and dimensions of a car — roughly two tons, and roughly 2 meters by 2 meters by 2 meters,” Gebald said. “And all the methods used to produce the CO₂ collectors could be well automated. So we have the automotive industry as a model for how to produce things in large quantities for low cost.

n 1954, the economist Paul Samuelson put forward a theory that made a distinction between “private-consumption goods” — bread, cars, houses and the like — and commodities that existed apart from the usual laws of supply and demand.

the other type of commodity Samuelson was describing is something now known as a “public good,” which benefits everyone but is not bought, sold or consumed the same way

direct air capture’s success would be limited to the size of the market for private goods — soda fizz, greenhouse gas — unless governments decided to intervene and help fund the equivalent of several million (or more) lighthouses.

An intervention could take a variety of forms. It could be large grants for research to find better sorbent materials, for instance, which would be similar to government investments that long ago helped nurture the solar- and wind-power industries. But help could also come by expanding regulations that already exist.

The Climeworks founders told me they don’t believe their company will succeed on what they call “climate impact” scales unless the world puts significant prices on emissions, in the form of a carbon tax or carbon fee.

“Our goal is to make it possible to capture CO₂ from the air for below $100 per ton,” Wurzbacher says. “No one owns a crystal ball, but we think — and we’re quite confident — that by something like 2030 we’ll have a global average price on carbon in the range of $100 to $150 a ton.” There is optimism in this thinking

A company that sells a product or uses a process that creates high emissions — an airline, for instance, or a steel maker — could be required to pay carbon-removal companies $100 per metric ton or more to offset their CO₂ output. Or a government might use carbon-tax proceeds to directly pay businesses to collect and bury CO₂.

“It doesn’t cost too much to pump CO₂ underground,” Stanford’s Sally Benson says. Companies already sequester about 34 million metric tons of CO₂ in the ground every year, at a number of sites around the world, usually to enhance the oil-drilling process. “The costs range from $2 to $15 per ton. So the bigger cost in all of this is the cost of carbon capture.”

The weekend before, Gutknecht told me, he received 900 unsolicited inquiries by email. Many were from potential customers who wanted to know how soon Climeworks could bury their CO₂ emissions, or how much a machine might cost them.

A Climeworks app could be installed on my smartphone, he explained. It could then be activated by my handset’s location services. “You fly over here to Europe,” he explained, “and the app tells you that you have just burned 1.7 tons of CO₂. Do you want to remove that? Well, Climeworks can remove it for you. Click here. We’ll charge your credit card.

The vast and constant market demand for fuel is why Carbon Engineering has staked its future on synthetics. The world currently burns about 100 million barrels of oil a day.

“So let’s say you’d have to supply something like 50 million barrels a day in 2050 of fuels,” he said. “That’s still a monster market.”

Carbon Engineering’s chief executive, added that direct-air-capture synthetics have an advantage over traditional fossil fuels: They won’t have to spend a dime on exploration

our plants, you can build it right in the middle of California, wherever you have air and water.” He told me that the company’s first large-scale facility should be up and running by 2022, and will turn out at least 500 barrels a day of fuel feedstock — the raw material sent to refineries.

Climeworks recently joined a consortium of European countries to produce synthetic methane that will be used by a local trucking fleet. With different tweaks and refinements, the process could be adapted for diesel, gasoline, jet fuel — or it could be piped directly to local neighborhoods as fuel for home furnaces.

the new fuels are not necessarily cheaper. Carbon Engineering aspires to deliver its product at an ultimate retail price of about $1 per liter, or $3.75 per gallon. What would make the product competitive are regulations in California that now require fuel sellers to produce fuels of lower “carbon intensity.” To date this has meant blending gas and diesel with biofuels like ethanol, but it could soon mean carbon-capture synthetics too.

Since they’re made from airborne CO₂ and hydrogen and could be manufactured just about anywhere, they could rearrange the geopolitical order — tempering the power of a handful of countries that now control natural-gas and oil markets.

From an environmental standpoint, air-capture fuels are not a utopian solution. Such fuels are carbon neutral, not carbon negative. They can’t take CO₂ from our industrial past and put it back into the earth

Even so, these fuels could present an enormous improvement. Transportation — currently the most significant source of emissions by sector in the United States — could cease to be a net emitter of CO₂

“If you can do one carbon-capture facility, where Carbon Engineering or Climeworks can build a big plant, great. You need to do that 5,000 times. And to capture a million tons of CO₂ with direct air capture, you need a small power plant just to run that facility. So if you’re going to build one direct-air-capture facility every day for the next 30 years to get to some of these scenarios, then in addition, we have to build a new mini power plant every day as well.

It’s also the case that you have to address two extraordinary problems at the same time, Peters added. “To reach 1.5 degrees, we need to halve emissions every decade,” he said. That would mean persuading entire nations, like China and the United States, to switch from burning coal to using renewables at precisely the same time that we make immense investments in negative-emission technologies.

this would need to be done even as governments choose among competing priorities:

“The idea of bringing direct air capture up to 10 billion tons by the middle or later part of the century is such a herculean task it would require an industrial scale-up the likes of which the world has never seen,”

Pacala wasn’t pessimistic about making a start. He seemed to think it was necessary for the federal government to begin with significant research and investments in the technology — to see how far and fast it could move forward, so that it’s ready as soon as possible

Gebald and Wurzbacher seemed to regard the climate challenge in mathematical terms. How many gigatons needed to be removed? How much would it cost per ton? How many Climeworks machines were required? Even if the figures were enormous, even if they appeared impossible, to see the future their way was to redefine the problem, to move away from the narrative of loss, to forget the multiplying stories of dying reefs and threatened coastlines — and to begin to imagine other possibilities.

Paradoxically, these same disastrous circumstances may also inspire altruism, compassion, optimism, and foster a sense of meaning and personal growth (otherwise referred to as post-traumatic growth) as people band together to salvage, rebuild, and console amongst the chaos and loss of a changing climate [30, 31].

Marginalized groups who tend to be the most affected by the mental and physical health implications of climate change are: Indigenous peoples, children, seniors, women, people with low-socioeconomic status, outdoor labourers, racialized people, immigrants, and people with pre-existing health conditions

The influential sociologist Anthony Giddens refers to this space and time distancing of the climate change problem as the Giddens Paradox [70]. The Giddens Paradox states that: “since the dangers posed by global warming aren’t tangible, immediate or visible in the course of day-to-day life, many will sit on their hands and do nothing of a concrete nature about them. Yet waiting until such dangers become visible and acute—in the shape of catastrophes that are irrefutably the result of climate change—before being stirred to serious action will be too late” (p. 2).

Marshall contends that part of the time and space distancing of the climate change problem, and thus the reluctance to act, is reinforced by the Western political discourse on climate change as a future-facing problem that intentionally overlooks the centuries of industrialization, fossil fuel consumption, and land degradation that contribute to anthropogenic climate change [71]

Marshall calls for a reckoning with this discourse by noting:“Climate change is a future problem. But it is also a past problem and a present problem. It is better thought of as a developing process of long-term deterioration, called, by some psychologists, a “creeping problem.” The lack of a definite beginning, end, or deadline requires that we create our own timeline. Not surprisingly, we do so in ways that remove the compulsion to act. We allow just enough history to make it seem familiar but not enough to create a responsibility for our past emissions. We make it just current enough to accept that we need to do something about it but put it just too far in the future to require immediate action” [71].

It requires coping strategies to manage the feelings and thoughts that arise so that people can face up to, and come to terms with, these threats and consequences rather than avoiding the creeping problem of climate change.

Since early 2007, environmental philosopher Glenn Albrecht and colleagues have taken note of emotional distress related to the awareness of the overarching problem humans face as a result of global climate change [96]

Albrecht et al. suggest that this awareness contributes to ‘psychoterratic syndromes’. Psychoterratic syndromes include phenomena such as ‘ecoanxiety’, ‘ecoparalysis’, and ‘solastalgia’. ‘Ecoanxiety’ refers to the anxiety people face from constantly being surrounded by the wicked and threatening problems associated with a changing climate [96]

‘Ecoparalysis’ refers to the complex feelings of not being able to take effective action to significantly mitigate climate change risks. ‘Solastalgia’ refers to “the distress and isolation caused by the gradual removal of solace from the present state of one’s home environment” [29].

For many people, climate change is experienced by way of vicarious threats or as an existential threat to civilisation [37]. People may experience vicarious threats when they receive weather warnings related to future disaster seasons or when they hear about environmental stressors experienced by people in other places.

For many people, this is largely how climate change is experienced—not as a direct threat, but as a global threat, often distant in time and place, or as a threat to our very way of life. Qualitative research finds evidence of some people being deeply affected by feelings of loss, helplessness, and frustration as they engage with the problems of global climate change [97].

Psychological adaptation requires a set of responses, it requires an acknowledgement of the grave threats posed by climate change and the profoundly consequential global crisis.

Exploring the complexity of psychological responses in the book, Climate change and human well-being, Weissbecker et al., discuss the full spectrum of psychosocial consequences of climate change-related events ranging from mental illness to more positive experiences like ‘Post Traumatic Growth’ (PTG), empathy, compassion, altruism, and emotional resilience [25].

It also requires behavioural and psychological engagement, in which people change and adjust their behaviour and lifestyle in order to reduce the threat and protect themselves.

Active hope—something Macy and Johnstone champion—supports psychological adaptation. Active hope is required to move hopeful intentions from a passive state where waiting for someone else to take-on the task of addressing the climate change problem is replaced with an active process of climate change mitigation and adaptation behaviours [106]

This active process occurs when the reality of the problem is acknowledged as is the magnitude of the problem, intentions to address the problem are set, and engaged actions take place.

While these three steps may oversimplify the complexity of acting in the face of bureaucracy, climate denialism, or downright avoidance and ignorance of the magnitude of the problem area, these three steps are indeed the pivot points of transformation. These pivot points, however, need to be upheld by global political will and policy commitments that tackle the problem at the appropriate scale and speed. To do so, public awareness of the severity, magnitude and range of health impacts—current and projected—is required to pressure governments and communities to act now.

Also, discernible interventions are needed to demonstrate a tangible path forward to respond to the risks and impacts we face in a changing climate. Examples of these types of interventions are explored below.

Other innovative approaches to addressing mental health and wellbeing in a changing climate writ large include experiencing and preserving nature. Koger et al. suggest that environmental preservation provides people with a sense of stewardship and personal investment that can help people overcome feelings of hopelessness, anxiety, and ecoparalysis [109]. Koger et al. suggest: “if people feel a deep connection to places, wilderness, and other species, then threats to these others are much more likely to be viewed as personal issues” [109]. Other research on the restorative benefits of natural environments and settings has found that biodiversity in natural environments is important for human health and wellbeing and has a particularly positive effect on mood, attention and cognition [110].

Dr Peter Alexander, at the University of Edinburgh, UK, was also impressed but noted: “There may be environmental benefits, eg for biodiversity, from sustainably managed grazing and increasing animal product consumption may improve nutrition for some of the poorest globally. My personal opinion is we should interpret these results not as the need to become vegan overnight, but rather to moderate our [meat] consumption.” Poore said: “The reason I started this project was to understand if there were sustainable animal producers out there. But I have stopped consuming animal products over the last four years of this project. These impacts are not necessary to sustain our current way of life. The question is how much can we reduce them and the answer is a lot.”

Climate change will make those threats even worse, as floods, drought, storms and other types of extreme weather threaten to disrupt, and over time shrink, the global food supply

food shortages could lead to an increase in cross-border migration.

A particular danger is that food crises could develop on several continents at once

“The potential risk of multi-breadbasket failure is increasing,” she said. “All of these things are happening at the same time.”

The report also offered a measure of hope, laying out pathways to addressing the looming food crisis, though they would require a major re-evaluation of land use and agriculture worldwide as well as consumer behavior

Proposals include increasing the productivity of land, wasting less food and persuading more people to shift their diets away from cattle and other types of meat.

“People’s lives will be affected by a massive pressure for migration,” said Pete Smith, a professor of plant and soil science at the University of Aberdeen and one of the report’s lead authors. “People don’t stay and die where they are. People migrate.”

activities such as draining wetlands — as has happened in Indonesia and Malaysia to create palm oil plantations, for example — is particularly damaging. When drained, peatlands, which store between 530 and 694 billion tons of carbon dioxide globally, release that carbon dioxide back into the atmosphere.

Between 2010 and 2015 the number of migrants from El Salvador, Guatemala and Honduras showing up at the United States’ border with Mexico increased fivefold, coinciding with a dry period that left many with not enough food and was so unusual that scientists suggested it bears the signal of climate change

As a warming atmosphere intensifies the world’s droughts, flooding, heat waves, wildfires and other weather patterns, it is speeding up the rate of soil loss and land degradation, the report concludes.

Higher concentrations of carbon dioxide in the atmosphere

will also reduce food’s nutritional quality, even as rising temperatures cut crop yields and harm livestock

In some cases, the report says, a changing climate is boosting food production because, for example, warmer temperatures will mean greater yields of some crops at higher latitudes. But on the whole, the report finds that climate change is already hurting the availability of food because of decreased yields and lost land from erosion, desertification and rising seas

Overall if emissions of greenhouse gases continue to rise, so will food costs, according to the report, affecting people around the world.

“You’re sort of reaching a breaking point with land itself and its ability to grow food and sustain us,”

agriculture itself is also exacerbating climate change.

the window to address the threat is closing rapidly

Every 2.5 acres of peatlands release the carbon dioxide equivalent of burning 6,000 gallons of gasoline

And the emissions of carbon dioxide continues long after the peatlands are drained. Of the five gigatons of greenhouse gas emissions that are released each year from deforestation and other land-use changes, “One gigaton comes from the ongoing degradation of peatlands that are already drained,”

(By comparison, the fossil fuel industry emitted about 37 gigatons of carbon dioxide last year, according to the institute.)

cattle are significant producers of methane, another powerful greenhouse gas, and an increase in global demand for beef and other meats has fueled their numbers and increased deforestation in critical forest systems like the Amazon

each year, the amount of forested land that is cleared — much of that propelled by demand for pasture land for cattle — releases the emissions equivalent of driving 600 million cars

The authors urge changes in how food is produced and distributed, including better soil management, crop diversification and fewer restrictions on trade

They also call for shifts in consumer behavior, noting that at least one-quarter of all food worldwide is wasted

But protecting the food supply and cutting greenhouse emissions can also come into conflict with each other, forcing hard choices. For instance, the widespread use of strategies such as bioenergy — like growing corn to produce ethanol — could lead to the creation of new deserts or other land degradation

The report also calls for institutional changes, including better access to credit for farmers in developing countries and stronger property rights

Planting as many trees as possible would reduce the amount of greenhouse gases in the atmosphere by about nine gigatons each year

But it would also increase food prices as much as 80 percent by 2050.

“We cannot plant trees to get ourselves out of the problem that we’re in,

“The trade-offs that would keep us below 1.5 degrees, we’re not talking about them. We’re not ready to confront them yet.”

Preventing global temperatures from rising more than 1.5 degrees Celsius is likely to require both the widespread planting of trees as well as “substantial” bioenergy to help reduce the use of fossil fuels

“Above 2 degrees of global warming there could be an increase of 100 million or more of the population at risk of hunger,” Edouard Davin, a researcher at ETH Zurich and an author of the report, said by email. “We need to act quickly

The same is true for planting large numbers of trees (something often cited as a powerful strategy to pull carbon dioxide out of the atmosphere), which can push crops and livestock onto less productive land

“Agricultural practices that include indigenous and local knowledge can contribute to overcoming the combined challenges of climate change, food security, biodiversity conservation, and combating desertification and land degradation,”

an average of three people were killed per week defending their land in 2018, with more than half of them killed in Latin America.

the longer policymakers wait, the harder it will be to prevent a global crisis. “Acting now may avert or reduce risks and losses, and generate benefits to society,” the authors wrote. Waiting to cut emissions, on the other hand, risks “irreversible loss in land ecosystem functions and services required for food, health, habitable settlements and production.”

Many scientists have been warning us for years, citing a pace of extinctions far beyond the historical "background" rate. Yet critics have argued that's based on inadequate data, preserving doubt about the scope of modern wildlife declines. To see if such doubt is justified, the 2015 study compared a conservatively low estimate of current extinctions with an estimated background rate twice as high as those used in previous studies. Despite the extra caution, it still found species are disappearing up to 114 times more quickly than they normally do in between mass extinctions

six important things to know about life in the sixth mass extinction:

1. This isn't normal.

"Even under our assumptions, which would tend to minimize evidence of an incipient mass extinction, the average rate of vertebrate species loss over the last century is up to 114 times higher than the background rate," the study's authors write. "Under the 2 E/MSY background rate, the number of species that have gone extinct in the last century would have taken, depending on the vertebrate taxon, between 800 and 10,000 years to disappear.

ndicating that a sixth mass extinction is already under way."

2. Space is at a premium.

The No. 1 cause of modern wildlife declines is habitat loss and fragmentation, representing the primary threat for 85 percent of all species on the IUCN Red List. That includes deforestation for farming, logging and settlement, but also the less obvious threat of fragmentation by roads and other infrastructure.

5. No species is safe.

The number of vertebrate species that have definitely gone extinct since 1500 is at least 338,

Even under the most conservative estimates, the extinction rates for mammals, birds, amphibians and fish have all been at least 20 times their expected rates since 1900, the researchers note (the rate for reptiles ranges from 8 to 24 times above expected). Earth's entire vertebrate population has reportedly fallen 52 percent in the last 45 years alone

he threat of extinction still looms for many — including an estimated 41 percent of all amphibian species and 26 percent of mammals.

4. It's probably still worse than we think.

The 2015 study was intentionally conservative, so the actual rate of extinctions is almost certainly more extreme than it suggests

The study also focuses on vertebrates, which are typically easier to count than smaller or subtler wildlife like mollusks, insects and plants. As another recent study pointed out, this leaves much of the crisis unexamined. "Mammals and birds provide the most robust data, because the status of almost all has been assessed," the authors of that study write. "Invertebrates constitute over 99 percent of species diversity, but the status of only a tiny fraction has been assessed, thereby dramatically underestimating overall levels of extinction.

we may already have lost 7 percent of [contemporary] species on Earth

3. Vertebrates are vanishing.

"If it is allowed to continue, life would take many millions of years to recover, and our species itself would likely disappear early on," says Gerardo Ceballos of the Universidad Autónoma de México, lead author of the 2015 study. "We are sawing off the limb that we are sitting on,"

6. Unlike an asteroid, we can be reasoned with.

n recent years, the mainstream environmental movement has moved strongly in the direction of social justice — the very opposite of what hate groups seek.

Now, the leaders of those organizations fear white nationalists are using green messages to lure young people to embrace racist and nativist agendas.

Environmental activists want to create a sense of urgency about climate change, the loss of biodiversity and other insults to the natural world, but they don’t want their messages to drive people into deranged ideologies.

There is a danger of “apocalypticism,”

The document believed to have been posted by the alleged El Paso shooter cites birthrates among the “invaders” trying to enter the United States and asserts, “If we can get rid of enough people, then our way of life can become more sustainable.”

environmentalists “need to steer away from this apocalyptic discourse because it too easily plays into the hands of apocalyptic white nationalism.”

these accused killers did not come up with their hateful ideologies in a vacuum. They have tapped into ideas about nature that are in broad circulation among white nationalists. Before the Unite the Right rally in Charlottesville in 2017, for example, white nationalist leader Richard Spencer published a manifesto that had a plank on protecting nature.

Ecofascism has deep roots. There is a strong element of it in the Nazi emphasis on “blood and soil,” and the fatherland, and the need for a living space purified of alien and undesirable elements

Some early conservationists embraced the eugenics movement that saw “social Darwinism” as a way of improving the human race by limiting the birthrates of people considered inferior. “There’s this idea coming out of the eugenics movement that nature, purity, conservation were linked to purity of the race,”

Some of those on the environmental left have seen the explosion in the human population — which is nearing 8 billion and has more than doubled in the past half-century — as a primary driver of the environmental crisis. That argument has then been adopted by racists.

It’s important, he said, to provide people with potential solutions and reasons to be hopeful: “There’s definitely a danger of people taking dire measures when they feel there’s no way out of it.”

if anti-immigrant groups are genuinely concerned about degradation of the natural world, they’re targeting the wrong people. Climate change hasn’t been driven by poor people struggling to get by. The activities of wealthy nations have been the main historical source of greenhouse gas emissions, the depletion of natural resources and the destruction of habitats.

‘Who are the people we need to limit? Who are the people making decisions about that?’ . . . Until we have true equity and equality and a balance of power, then we know vulnerable communities are going to end up on the negative side of the ledger, whatever the tough choices are,”

Yes, billions of dinosaur bodies died and fell to the Earth here in this span, and trillions more dinosaur footsteps pressed into the Earth, but hardly a trace remains today. A cryptic smattering of lakeside footprints represents their entire contribution to the Triassic period. A few bones and footsteps miraculously preserved in New England and Nova Scotia are all that remains from the entire 27-million-year Early Jurassic epoch. No trace of dinosaurs remains whatsoever from the 18-million-year Late Jurassic. A handful of bones from one layer in Maryland represents the entire 45-million-year Early Cretaceous; the Late Cretaceous gives up a Hadrosaurus in New Jersey, and part of a tyrannosaur in Alabama, but mostly comprises unimpressive fragments of bone and teeth that cover the remaining 34 million years of the Earth’s most storied age, until doomsday

So that’s what 180 million years of complete dominance buys you in the fossil record. What, then, will a few decades of industrial civilization get us? This is the central question of the Anthropocene—an epoch that supposedly started, not tens of millions of years ago, but perhaps during the Truman administration

as the example of the dinosaurs shows, the chance that any city-swallowing delta deposit from a window of time only a few centuries wide would be lucky enough to be not only buried and preserved for safekeeping, but then subsequently not destroyed—in the ravenous maw of a subduction zone, or sinking too close to the cleansing metamorphic forge of Earth’s mantle, or mutilated in some m

there exists a better word in geology than epoch to describe our moment in the sun thus far: event. Indeed, there have been many similarly disruptive, rapid, and unusual episodes scattered throughout Earth history—wild climate fluctuations, dramatic sea-level rises and falls, global ocean-chemistry disasters, and biodiversity catastrophes

nd then, after all that, find itself, at a given point in the far future, fantastically lucky enough to have been serendipitously pushed up just enough so as to be exposed at the surface, but not too high as to have been quickly destroyed by erosion … is virtually ni

What else of us could be sampled from this sliver of deep-sea-muck-turned-rock—these Anthropocene clays and shale layers? Pass it through a mass spectrometer and you would see, encoded in its elements, the story of the entire planet in this strange interval, the Great Derangement of the Earth’s systems by civilization. You would see our lightning-fast injection of hundreds of gigatons of light carbon into the atmosphere written in the strange skew of carbon isotopes in this rock—as you do in rocks from the many previous carbon-cycle disasters of Earth history. The massive global-warming pulse created by this carbon disaster would be written in oxygen isotope

The sulfur, nitrogen, thallium, and uranium isotopes in these rocks (to mention just a few) would whisper to you—again, in squiggles on a graph—that the global ocean lost much of its oxygen during this brief but enigmatic interval. Strontium isotopes would tell you that rock weathering dramatically accelerated worldwide for a few tens of thousands of years as sweltering, violent storms attacked the rocks and wore down the continents during a brief, CO2-driven fever.

The most enduring geological legacy, instead, will be the extinctions we cause. The first wave of human-driven extinctions, and the largest hit to terrestrial megafauna since the extinction of the dinosaurs, began tens of thousands of years ago, as people began to spread out into new continents and islands, wiping out everything we tend to think of as “Ice Age” faun

we’re very likely to return to our regularly scheduled programming and dive back into a punishing Ice Age in the next half-million years. This means that sea level—after shooting up in the coming millennia by our own hand, and potentially burying coastal settlements in sediment (good for fossilization)—will eventually fall hundreds of feet below where it is today, and subject the shallow continental shelves, along with our once submerged cities and magnificent seams of garbage, to the cold winds of erosion (bad for fossilization), where they’ll be mostly reduced to nothing

The first major mass extinction, 445 million years ago, took place in multiple pulses across a million years. An event. The second major mass extinction, 70 million years later, took place over 600,000 years—400,000 years longer than the evolutionary history of Homo sapiens.

The idea of the Anthropocene inflates our own importance by promising eternal geological life to our creations. It is of a thread with our species’ peculiar, self-styled exceptionalism—from the animal kingdom, from nature, from the systems that govern it, and from time itself. This illusion may, in the long run, get us all killed.

"For birds in particular, we've seen all of the warning bells go off that we're in a biodiversity crisis," said Umekubo. "By restoring these [federal] protections, we'll be giving them a fighting chance."

The cost of an electric car can be prohibitive, it’s true, or at least it can appear to be from a glance at the window sticker. But we chose a Nissan Leaf, a vehicle made by our neighbors down in Smyrna, Tenn., and the model we bought qualified for the highest possible federal tax credit. So the actual cost of our car was $7,500 less than the price we paid for it, even if it didn’t seem that way when we signed the papers.

Even without the tax credit, many upcoming models are projected to cost no more than their carbon-spewing counterparts. The number of purchase options is about to explode, too, so you don’t have to give your money to Elon Musk if you want to drive an electric vehicle.

But none of these potential liabilities should be deal breakers. I love our little red Leaf, and I have never had a single moment of buyer’s remorse since we brought it home. It’s quiet, it’s comfortable, and it’s amazingly fun to drive.

All I can hope is that by the time we need to replace it, all our options will be electric. Because if they aren’t, the planet will pay a terrible price.

Since the 1980s, the government recognized that nature is Costa Rica’s strongest asset and has therefore made every effort to protect it: including, among other things, zoo closures, reforestation, and establishing protected areas (25% of the total surface area of the country). “With its rich biodiversity, Costa Rica has also demonstrated far-sighted environmental leadership by pursuing reforestation, designating a third of the country protected natural reserves, and deriving almost all of its electricity from clean hydro power.” – Joseph Stiglitz

“Decarbonization is the great task of our generation and Costa Rica must be one of the first countries in the world to accomplish it, if not the first.”

it is also conscious of the well-being of its citizens. It is part of the Wellbeing Economies Alliance—a coalition that includes Scotland, New Zealand, and Slovenia—which instead of emphasizing countries’ GDP, “seeks to ensure that public policy advances citizens’ wellbeing in the broadest sense, by promoting democracy, sustainability, and inclusive growth,” according to a recent column by economist Joseph Stiglitz.