Water levels are running dangerously low in reservoirs across the U.S. Southwest. Declining flows in the Gila River have pushed levels to below 1 percent of capacity in Arizona’s San Carlos Reservoir
The Western U.S. is grappling with an extended drought. Nikk Ogasa explores the possibility that this continued dryness (and the fires and other hazards associated with it) could be our new climate change induced reality…
Kearny, Ariz., is a town on the brink. Located at the foot of the Dripping Spring Mountains in eastern Arizona, this small community of 2,000 people sources its water from the Gila River, a verdant waterway that snakes by the southern edge of town.
But in March, the snowpack feeding the river had dropped to precipitous levels: It was just 1 percent of its historic norm for that time of year. The Gila River water commissioner slashed Kearny’s allotment of river water by some 85 percent. And in April, town officials announced that “Zero Day” was approaching, at which point the taps would run dry.
“We need rain,” says Norm Warren, a lifelong Kearny resident. He owns the only large grocery store within a 45-minute drive of the town. Without tap water for refrigerator cooling systems, Warren says he won’t be able to store perishable products like meats and fresh produce.
Kearny’s dilemma foreshadows a crisis building across the American Southwest. Since 2000, the region — which includes Arizona, New Mexico, California, Utah, Colorado and parts of northern Mexico — has endured a historic “megadrought,” or a period of severe dryness that persists for decades. Scientists say it’s the driest this region has been in 1,200 years.
“We’re 27 years into it, and it shows no signs of letting up,” says Brad Udall, a water and climate researcher at Colorado State University in Fort Collins.
Scientists point to two factors causing the drought — rising temperatures and declining precipitation. Heat from human-caused climate change creates a thirsty atmosphere that is more effective at drying out the landscape, says Kevin Anchukaitis, a dendrochronologist who runs the University of Arizona Laboratory for Tree-Ring Research in Tucson. As for the lack of rain, many researchers wonder if it is simply a stroke of bad luck.
But a controversial study published in Nature in 2025 suggests something far more ominous: Humankind has disrupted a naturally occurring climate cycle in the Pacific Ocean that historically ushered episodes of wet weather into the Southwest. If that’s true, Udall says, things are not looking good for places like Kearny. Other researchers worry that the megadrought may be locked in place for the foreseeable future…
[Ogasa unpacks both the more traiditional analysis and the new hypothesis– that human behavior has disrupted the Pacific Decadal Oscillation, or PDO, an alternating climate pattern in which areas of warmer and cooler than normal surface waters switch their positions on a timescale of many decades…]
… “The conventional wisdom suggested that the PDO could shift any given year, and we [wouldn’t] have to worry about drought [after that],” says climate scientist Jeremy Klavans of the University of Miami.
But he and colleagues weren’t so sure. They dug into that assumption, analyzing more than 500 simulations of the PDO from a dozen major climate models. They examined how the PDO shifted — and stabilized — in the presence of outside forces such as volcanic eruptions, solar variation and levels of greenhouse gases and aerosols.
Their finding: Greenhouse gas and aerosol emissions had effectively hijacked the behavior of the PDO over the last 50 years by altering atmospheric temperatures, the team reported in 2025 in Nature.
Ballooning concentrations of industrial aerosols — which can have an atmospheric cooling effect — probably pushed the PDO to increasingly favor its warm phase starting in the 1950s, the researchers say. But in the 1980s, clean air legislation decreased aerosol emissions even as greenhouse gas levels continued to rise and warm the atmosphere. That combination drove the PDO toward its cool phase, making drought conditions more likely in the Southwest. Instead of being a rare event, drought “becomes kind of commonplace,” Klavans says….
… the current climate models may actually be underestimating the potential duration of the ongoing megadrought, based on those findings, says study coauthor Victoria Todd, a climate scientist at the National Center for Atmospheric Research in Boulder, Colo.
That could be bad news for the American Southwest, Udall says. Even if people stopped emitting greenhouse gases today, planet-warming carbon dioxide will continue to accumulate in the atmosphere, locking the PDO and megadrought into place, potentially for decades. If the emerging science is right, then the Southwest is going to keep getting drier and drier, Udall says. “No question about it.”
Warm Phase (1977-1998): During the PDO’s warm phase, the Pacific jet stream (red arrow) moves south over North America, drawing wet weather patterns into the Southwest.
Cool phase (1999–now): When the PDO switches to its cool phase, the Pacific jet stream (blue arrow) moves north, diverting wet weather patterns out of the Southwest and making drought more likely.
The hypothesis that human emissions have disrupted the PDO could be put to the test this year. That’s because scientists are predicting a historically strong El Niño, a Pacific climate pattern characterized by months of warmer than normal sea surface temperatures in the eastern equatorial Pacific. El Niños often bring wet conditions to the Southwest — and they have been known to force the PDO into a different phase. For example, the 1976–1977 El Niño helped push the PDO into a warm phase for nearly a quarter of a century.
But a powerful El Niño in 2015 wasn’t able to force the switch for more than a few years. That suggests the PDO may be slowly changing, Klavans says. “Something’s different here.”
Even if the current El Niño is strong enough to force the PDO into a warm phase, no one should expect the megadrought to go away any time soon, Seager says. “We’re talking about something that’s been going on for a few decades now. Even one very wet winter is not going to be enough to restore Colorado River reservoirs to where they would preferably be.”…
… Even in the best-case scenarios, the Southwest never returns to the wet years of the 1980s and ’90s, when lakes Powell and Mead reached maximum capacity numerous times, the researchers reported in 2023 in npj Climate and Atmospheric Science. The findings instead suggest that, regardless of what the PDO does, the region will face a far drier climate than it did in its recent past. In other words, even if the megadrought were to end, the Southwest faces an uncertain future when it comes to water, according to the study.
Communities need to prepare for the future by improving their water conservation efforts and infrastructure, Anchukaitis says. Those practices will grow only more crucial as the Southwest’s population continues to balloon: Utah, Texas, Nevada, Colorado and Arizona are among the 10 fastest growing states by population this decade, according to a 2024 report by the University of Virginia’s Weldon Cooper Center for Public Service.
Even if wet weather returns, Anchukaitis says, the cities of the Southwest shouldn’t fall into complacency. “[More rain] doesn’t mean that … megadroughts aren’t going to come back,” he says. “Maybe it buys us some time to ease systems into a new way of thinking.”…
As we pray for rain, we might recall that it was on this date in 2006 that NASA recorded th largest ozone hole in the atmosphere to date. From September 21-30, the average area was 10.6 million square miles, as measured by the Ozone Monitoring Instrument on NASA’s Aura satellite. At the worst point, a record low of 1.2 Dobson Units compared to a 125 DU non-hole reading. For the past several decades, each year during the Southern Hemisphere Spring (Northern Hemisphere Autumn) chemical reactions due to chlorine and bromine man-made compounds in the atmosphere cause the destruction of ozone in the stratosphere over the southern polar region… all contributing to the phenomenon discussed above.
False-color view of total ozone over the Antarctic pole. The purple and blue colors are where there is the least ozone, and the yellows and reds are where there is more ozone. (source)
Beachgoers rest on the beach of Moutchic on the shore of Lake Lacanau in Lacanau, southwestern France on July 24, 2026, as clouds of smoke rise into the sky from the Gironde wildfire
A bracing essay from Adam McKay (director of Don’t Look Up, Vice, and The Big Short, among many other films), arguing that our acceptance of assurances that we have time left to address climate change, or that “Net Zero by 2050” will save us, is driving us toward full social collapse in ways that become more obvious with every new broken temperature record…
Lies are a lot like gourds. They come in hundreds of different varieties, sizes, and bulbous, twisty shapes. Some are off-puttingly spiked and prickly, while others remind us of fall childhood memories.
Some lies, if prepared correctly like squash or pumpkin, can appear delicious and irresistible, concealing a dark reality: “I can’t believe you’re not a model! For five thousand dollars I can photograph you so you have a portfolio.” The central aim of most lies is to avoid consequences. When an untruth is especially desperate and self-serving, it can be unintentionally hilarious: “Yes I tried marijuana… but I did not inhale.”
Embezzling money or murdering someone for the insurance pay-out are part of a phylum of lies that cross into serious criminality. These deceptions’ sphere of influence often stays fairly localized. But sometimes covering up the initial lie can spawn lots of other lies that spread and spread, like with Watergate or Bernie Madoff. What started as a little decorative Thanksgiving-gourd-sized lie suddenly becomes larger and quite ugly. This family of lies strives to not only avoid consequences, but to gain status and resources, another common end game of many deceptions.
And then there are the large society-wide lies: hulking distortions and misrepresentations watered and tended to by leaders, mass media, culture, and industry.
This particular sub-genus of grifts, half-truths and strategic omissions have led throughout modern history to wars, mass death, societal collapse, and the theft of humanity’s great treasures. “Manifest Destiny.” “Aryan superiority.” “The divine right of kings.” “The domino theory.” “Israel has a right to defend itself.” “Oxycontin isn’t addictive because it’s time-released.” These county-fair, blue ribbon-winning prevarications tend to be driven by a myriad of short-term incentives, irrational manipulated fears, unexamined assumptions, convenient blind spots, and of course… the desire to avoid consequences and expand status and resources.
“People always pay their mortgages” became the half-true rallying cry used by Wall Street, news media, and politicians to collapse the world economy in 2007. Turns out when you change lending rules to feed an unregulated derivatives market by giving mortgages to people who can’t pay them… they don’t. “Saddam Hussein has weapons of mass destruction” (along with the subvariations on the central lie—“We want to bring democracy,” “If you don’t support the troops, you support the terrorists,” “Saddam orchestrated 9/11,” etc) killed a million people, devastated the entire nation of Iraq, and in many ways also gutted the United States, all while enriching oil companies, weapons manufacturers, big banks, juicing TV ratings, and expanding the power of the Bush/Cheney presidency.
However, there is one type of rare, gargantuan, towering lie that makes all the other mass lies throughout human history seem like frightened, scurrying, little adorable fibs.
It is a lie told worldwide by hundreds of thousands of institutions, elected officials, many universities, legacy news, some large non-profits and eventually—as the deception entered mainstream culture—even by ourselves, to ourselves, every single moment of every day. It is a constantly growing gourd that even as a baby back in the 1970s was the size of three aircraft carriers. These days it is so massive it is almost easier to refer to what isn’t part of it (Disneyland, a BLT, that green croc by the side of the highway) than what is.
This massive lie can best be summed up as “when it comes to climate change… we have more time.”
To be clear, we are not talking about the kind of total climate denial one would find on the extremist, lunatic fringe inhabited by the likes of Alex Jones or the current U.S. President. And we’re not referring to cartoonish hucksters and “climate skeptics” like Joe Rogan or Jordan Peterson.
Polling shows only 14.8 percent of Americans deny the basic sixth grade science behind global warming. To put that in perspective, as much as 10 percent of the population still believes the Earth is flat.
No, the monstrous, misshapen garden colossus lie we’re referring to is subscribed to by most of the U.S., has stopped and slowed climate action far more than outright denial, and keeps growing and growing. Every day this deception whispers seductively in the ears of mankind: “global warming is real but not urgent… Keep doing what you’re doing.”
Less embarrassing than “climate change is a Chinese hoax,” but every bit as unscientific and ridiculous, it is the preferred lie of the ruling class, mainstream news media, and corporations.
Sir David King—former science advisor to the United Kingdom, professor at Oxford and then Cambridge, winner of too many awards to list and as establishment as they come—was quoted as saying that what we do over the next three to four years will determine the fate of humankind.
He said this… in 2021…
[McKay unpacks a chilling variety of examples of “the lie” in action, contrasting government/media/corporate messages with the reality to which the )ostensibly) refer…]
… Still have doubts? If you do, I don’t blame you. We live in a consumer culture hammering us daily with triggering political proclamations, sales pitches, and clickbait designed to spike engagement responses in the brain. “Immigrants are coming for your way of life!” “This new SUV is the best ever!” “Great White Shark Eats Porn Star!” Most of it is misleading, in one way or another, so there’s a natural tendency to assume that “Planet about to boil!” might be too.
But Big Oil and its PR agencies know this, and they’ve weaponized the healthy skepticism we’ve developed as a survival mechanism against those voices speaking the truth about the urgent state of the climate.
After all, who are you going to believe? The New York Times, an outlet famous for downplaying climate urgency, or some weird scientist saying crazy things? Even when a profession famous for dead-eyed, bottom-line risk assessment like insurance actuaries releases a statement about how serious the situation is, corporate news media turns it into what people used to call a “below the fold story,” framing it as just another minor environmental item—not headline news.
In service of the Great Lie, the government of the United Kingdom even tried to bury a climate report from its own intelligence agency before it was leaked. To my knowledge there aren’t many spies being called tree huggers, unless they’re undercover of course. But the MI5 and MI6 are clear-eyed about the danger that’s coming. The report warned that “global ecosystem degradation and collapse threaten UK national security and prosperity.”
No one wants to eat a raw pumpkin. It looks like a Dr. Seuss character’s brain, is full of seeds, and has no real taste. But like with any good lie, when the right sugar, spices, a buttery crust, and time in the oven is added, pumpkin pie becomes a cherished classic.
The same thing happens with the climate lie. The financial markets, massive oil companies, the banks that finance them, the travel industry, car companies, your career and job security, the people you’re having dinner with who don’t want to be bummed out, all of these incentives and forces don’t want you to know you are eating a big, weird gourd.
And as long as we go with their mendacious flow, hundreds of millions, and then billions will die well before “Net Zero by 2050” or “our great grandkids’ future” arrive. Because we are out of time. And we need to get to work immediately. There are a million things to do…
As Pope John Paul II said, “An excuse is worse and more terrible than a lie, for an excuse is a lie guarded.”
As we face up, we might spare a thought for Blaise Pascal; he died on this date in 1662. A French mathematician, physicist, theologian, and inventor (e.g., the first digital calculator, the barometer, the hydraulic press, and the syringe), his commitment to empiricism (“experiments are the true teachers which one must follow in physics”) pitted him against his contemporary René “cogito, ergo sum” Descartes– and was foundational in the acceleration of the scientific/rationalist commitment to measurement (and the conclusions/actions they dictated).
Relevantly to McKay’s piece, Pascal also advanced the philosphical argument we know as “Pascal’s Wager.” While he posed the exercise as a life-defining gamble regarding the belief in the existence of God, we can easily transpose it to apply to climate change action:
Pascal contends that a rational person should adopt a lifestyle consistent with the existence of God and should strive to believe in God. The reasoning for this stance involves the potential outcomes: if God does not exist, the believer incurs only finite losses, potentially sacrificing certain pleasures and luxuries; if God does exist, the believer stands to gain immeasurably, as represented for example by an eternity in Heaven in Abrahamic tradition, while simultaneously avoiding boundless losses associated with an eternity in Hell. –source
If the threat of climate change is, as “the lies” suggest, real but distant, then immediate action only costs us some short-term sacrifice. But if that threat is imminent, immediate action could preserve our way of life and the prospect of an improving future for us and our children and their children… while inaction is likely to end in utter disaster.
The first two installments of what will be an on-going series from ProPublica and Drilled, covering fossil fuel companies in the 1990s who, even as they denied the reality of climate change, were quietly funding research that favored climate fixes that would protect their businesses…
An investigation by ProPublica and Drilled has found that fossil fuel companies have been funding climate research at prestigious U.S. universities for more than 30 years. Their support has helped amplify the work of scientists who promote the idea that we can stop the climate crisis without breaking our dependence on oil, gas, and coal.
The research produced by those schools in turn shaped global climate models, as well as the policy and technology solutions adopted by governments around the world.
Ultimately, it fostered a misperception that climate change could be solved without dramatically curtailing fossil fuels — a notion that has delayed emissions cuts by decades.
Corporate funders sponsored entire centers, paid the salaries of researchers, kept offices on campus and in some cases had veto power over projects.
Companies maintain they are supporting innovation and needed science. Universities say that with safeguards, sponsorship enhances research programs while preserving academic independence.
Still, the impact of funding constitutes a pattern that Benjamin Franta, an associate professor of climate litigation at University of Oxford, called the “colonization of academia.”…
“Why Carbon Capture Can’t Conceivably Solve Climate Change“- For decades, oil companies have funded universities’ research into climate change “solutions” that would not require the public to stop using oil and gas. Carbon capture is one of their favored ideas. One snag: It won’t fix the climate crisis. From Katie Worth and Lucas Waldron.
“How Oil Execs Shaped A Landmark Climate Study“- BP created an elite Princeton research center to address the climate problem without getting off fossil fuels. Its key work, a paper known as “Wedges,” shaped climate discourse for a generation. From Maddie Stone.
As the first piece concludes…
Climate experts know about the costs, technical troubles, and failures of CCS [Carbon Capture and Sequestration] test projects.
Yet many of them have continued to boost the technology, even as they have downplayed solutions showing greater progress.
For example, the same modelers who overestimated the potential of geological carbon storage repeatedly underestimated solar power — one of the energy technologies that would allow more oil to remain in the ground.
As we face facts, we might give ourselves a short break on this, the anniversary of “Raspberry Beret,” by Prince & The Revolution, hitting #1 on the charts in 1985.
Here is the official video (now in 4K). Directed by his Purple Majesty himself, it features graphics and animation from Drew Takahashi, George Evelyn, and the crew at Colossal Pictures.
Weather sensors like the one above and other monitoring tools can help collect tailored data for specific climate hazards.
Adapting to climate change is quickly becoming part of everyday life. Nabig Chaudhry outlines seven trends we’re seeing for 2026 and beyond…
Within the climate and scientific communities, there’s growing concern about how quickly the world is approaching (and may exceed) 2°C of warming. 2024 was the first calendar year in which global average temperature exceeded 1.5°C above preindustrial levels. The impacts of rapid warming are becoming harder to miss: The climate is changing quickly almost everywhere, local and global climate risks are growing, progress on mitigation has become more politically constrained and uncertain, and many of our systems and policies aren’t prepared for the conditions ahead.
Growing climate risk is increasing the demand for new technologies, tools, strategies, and ways of thinking about climate adaptation. Since publishing our Insights on Climate Adaptation in 2025 report, the practice of climate adaptation has continued to develop, as more people, communities, organizations, and institutions work to understand and respond to climate risks.
People use different language to describe climate adaptation (including climate resilience), but the work centers on helping people, communities, and organizations manage the risks of a changing climate. Those activities are expanding, and we can already see signs. For example, new funding and investment vehicles are emerging, such as Tailwind Futures, and adaptation is receiving more dedicated space at major climate convenings, including The Adaptation Forum, a co-hosted gathering of thought leaders in the adaptation space during Climate Week NYC 2025.
In my role as Director of Climate Adaptation Research at Probable Futures and through my PhD program at the University of California, Berkeley, I speak with experts, read emerging research, and study adaptation developments every day. Through these conversations and insights, I’ve reflected on which adaptation trends are likely to emerge and strengthen…
Elevating insurance as a force in adaptation planning, policy, and behavior
Insurance is a valuable adaptation tool, as it can transfer risk, support recovery after climate shocks, and help signal where danger is increasing through premiums, deductibles, coverage limits, or insurer retreat. It can also shape incentives, because the way risk is priced can influence whether and how people and institutions reduce exposure, strengthen buildings, or avoid certain kinds of development.
As climate risks grow, damage to property and homes becomes more frequent and severe. Property owners are experiencing those shocks both physically (flooding, fire, wind damage, etc.) and financially as insurance markets adjust and recalibrate in response to changing probabilities and severities. Insurance markets have begun reflecting climate risk, and those changes are starting to influence where and how people build homes and infrastructure, where they invest in property, and where they choose to live.
A useful example of how insurance is beginning to influence adaptation efforts in the public sphere is Strengthen Alabama Homes, a program of the Alabama Department of Insurance. The program provides grants to help homeowners retrofit their homes and roofs to reduce wind damage from extreme winds and storms. Homeowners who participate can receive discounts on the wind portion of their homeowner’s insurance premium, which makes insurance not only a tool for recovery but also a tool for encouraging adaptation before exposure occurs.
Insurance pricing is one way climate risk is made visible, priced, and acted on through adaptation. I expect that insurance will increasingly influence adaptation planning, policy, and behavior, not only by helping people recover after climate shocks, but by shaping the choices people make before those shocks occur. The development of the insurance industry will therefore be an important factor in adaptation. If insurers become a source not only of risk pricing but also of risk information, adaptation guidance, and incentives to reduce risk, they could help more people act before losses occur. But that would require a meaningful shift in the role of insurance companies, from mainly pricing and transferring risk to also helping people reduce it…
The second goes to the contentious topic of geoengineering…
Expanding debate around the role of climate intervention
As warming continues, risks keep growing. We have more, clearer, worrisome signals that irreversible change, tipping points, and local climate changes so severe that adaptation is impractical if not impossible, are not far off. In response, people and institutions are starting new conversations about global-scale responses. One of those responses is climate intervention, sometimes called geoengineering.
Climate intervention generally refers to intentional efforts to alter Earth’s systems in order to counteract some of the effects of climate change. It can include approaches that remove carbon dioxide from the atmosphere, as well as approaches that reflect a portion of sunlight back into space, such as stratospheric aerosol injection.
Its relationship to adaptation is uneasy, but important. If climate intervention is, at its core, an effort to manage the otherwise unmanageable risks of global climate change, then is it another tool for adapting to climate change, or is it something fundamentally different? There is no consensus, and there may never be, not least because global action will cause uneven responses locally. We don’t know much about the potential impacts of some climate interventions, how they could affect different regions unequally, or what long-term consequences they may have for Earth’s climate and natural systems.
There are good reasons to have informed conversations and do fundamental research on intervention. People with adaptation expertise can help explore, illuminate, and explain what climate intervention could mean for society and nature. There are also likely to be benefits for adaptation professionals to participate in these conversations and research projects. Even if climate intervention is never widely deployed, the debate itself may shape adaptation thinking, climate policy, research funding, public trust, and international governance.
Climate change requires people to consider risks and options, whether for mitigation, adaptation, or intervention. Treating strategies for managing the rate, pace, and impacts of climate change as distinct and separate is unlikely to lead to good outcomes. I am hopeful that there will be more collaboration across these new fields as society faces new challenges that have a common root cause. This may include more discussion about how these technologies should be governed, whether they should receive more investment, and whether climate intervention is a possible third leg alongside mitigation and adaptation…
As we prepare, we might recall (wistfully) that it was on this date in 1942 that Bing Crosby, with the Trotter Orchestra and the Darby Singers, recorded Irving Berlin’s song, “White Christmas.” According to the Guinness Book of World Records, this version is the best-selling single of all time with an excess of 50 million copies sold worldwide. (In fact, the version most often heard today is not the original. After frequent use, the master had become damaged, so on March 18, 1947, Crosby re-recorded the holiday hit.)
The global conveyor belt, shown in part here, circulates cool subsurface water and warm surface water throughout the world. The Atlantic Meridional Overturning Circulation is part of this complex system of global ocean currents. This illustration is captured from a short video produced by NOAA Science on a Sphere.
A significant part of the earth’s climate infrastructure is under threat. New research suggests the Atlantic Meridional Overturning Circulation (or AMOC) could weaken by half this century with wide ranging consequences for weather, food, and sea levels across the world. Alison Smart and Charlotte Venner unpack the past and ponder the future of this critical ocean current…
London, England, and Quebec City, Canada sit at roughly the same latitude (51°N and 47°N, respectively) but have vastly different climates. Historically, Quebec City had 99 freezing days in an average year—weather you might expect from its relative proximity to the Arctic—but London only experienced three freezing days in an average year, despite being slightly further north. This difference is largely due to an ocean current called the Atlantic Meridional Overturning Circulation (AMOC), which distributes warmth from the Tropics via the Atlantic Ocean.
Now, impacts from climate change are weakening the AMOC, and it could collapse entirely in the near future. AMOC collapse would rapidly make regions of the Northern Hemisphere with historically mild weather colder and harsher, while triggering irreversible changes in the global climate.
The AMOC is both the product of a stable climate and a factor in maintaining weather patterns around the planet. To plan for future scenarios, we need to first understand how the AMOC works and what might happen if it collapses…
[Smart and Venner explain the AMOC and outline the ways in which it shapes the climate of regions around the world…]
… Even minor weakening of the AMOC can significantly impact local climates, as has happened several times in the past 12,000 years. A “Little Ice Age” occurred in Europe in the Middle Ages, likely connected to a disruption in the AMOC. Just a slight slowdown in the AMOC could make Europe colder overall, disrupt global precipitation patterns from South America to India, and worsen drought in Africa.
The more freshwater pours into the ocean, and the more ocean temperatures rise, the weaker the AMOC becomes—until, at some threshold, it could stop moving altogether.
It is possible that the AMOC will collapse entirely if warming continues. There is no agreed-upon global average temperature at which collapse becomes certain, but there are signals we can track and historical examples we can examine to predict the likelihood of collapse…
… The consequences of total AMOC collapse would be far-reaching, severe, and irreversible on timescales relevant to humans. AMOC collapse would cool parts of the Northern Hemisphere and warm parts of the Southern Hemisphere by multiple degrees Celsius and drastically alter weather around the world.
In Europe, winter temperatures would drop, cold snaps could increase, and winter storms would intensify. A 2025 research letter found that, even if global warming reached 2°C, AMOC collapse would make Europe colder than it is today, creating extreme winters in Northwestern Europe in which record cold might reach -20°C (-4°F) in London and -50°C (-58°F) in Scandinavia. Even milder cold days would increase, with approximately 150 to 180 frost days per year in Utrecht, Netherlands, compared to a historic average of about 53. Precipitation would likely shift and decrease, potentially drying out some parts of Europe and making others wetter.
Around the world, other climates would change, likely in less extreme ways.
North America. The East Coast of North America would likely experience rapid sea level rise as the gravitational pull of the AMOC weakens, as well as cooler conditions, with some parts of Eastern Canada and the North Atlantic coast cooling by several degrees Celsius, erratic storms, weather variability, and more intense hurricanes.
Tropics & South America. Without the AMOC, the ITCZ would shift south, potentially leading to drying in the Northern Tropics and parts of the Amazon and wetter conditions in the Southern Tropics.
Africa. Because of the shift in the ITCZ, West Africa and the Sahel would be much drier, experiencing severe and frequent drought and reduced rainy seasons. The Sahel could possibly transition from a semi-arid climate to hot dry desert.
Asia. Because of the shift in the ITCZ, weakened and more erratic monsoons in Asia would lead to increased drought and a higher risk of extreme precipitation events.
These changes may occur rapidly, create climate risks, and cause systemic disruption in affected regions. The collapse of the AMOC would also be a tipping point in the global climate, meaning that the changes would likely be difficult, if not impossible, to reverse on human timescales.
Once the AMOC passes a critical threshold of weakening, called a tipping point, it would continue to weaken until it collapses. AMOC collapse could also create systemic impacts that activate other tipping points as well as feedback loops that could generate further warming.
For example, if AMOC collapse contributed to changes like a permanent dieback of the Amazon Rainforest or increased ice loss, those changes would generate their own warming effect on Earth’s climate. A 2026 paper suggests that AMOC collapse would result in substantial carbon release from oceans and add around 0.2°C in additional atmospheric warming.
Reducing greenhouse gas emissions may slow warming enough to reduce weakening and delay collapse. If collapse begins, it is unlikely we could stop it. There is no feasible technological way to reengineer ocean currents…
As we put on our sailin’ shoes, we might send interconnected birthday greetings to Andrew Sharrett; he was born on this date in 1946. An archaeologist, his application of world-systems theory to questions of change on large, often global, scale made him one of the most influential archaeologists of the late 20th/early 21st centuries. Sharrett is best known for his theory of the secondary products revolution; but his work touched on a broad range of fundamental human developmental issues: global migration and colonization, the spread of agriculture, the development of metallurgy and urbanism, and the development of new forms of consumption, to name a few. All of those dynamics were, as Sharrett observed, shaped in significant ways by the climatic conditions in which they unfolded.
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