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With governments "scaling back their already meager" actions to tackle climate breakdown, said one ecologist, "our present-day human culture is on a suicide course."
Less than six months away from the next United Nations summit for parties to the Paris climate agreement, scientists on Tuesday released a study showing that even meeting the deal's 1.5°C temperature target could lead to significant sea-level rise that drives seriously disruptive migration inland.
Governments that signed on to the 2015 treaty aim to take action to limit global temperature rise by 2100 to 1.5°C beyond preindustrial levels. Last year was not only the hottest in human history but also the first in which the average global temperature exceeded 1.5°C. Multiple studies have warned of major impacts from even temporarily overshooting the target, bolstering demands for policymakers to dramatically rein in planet-heating fossil fuels.
The study published Tuesday in the journal Nature Communications Earth and Environmentwarns that 1.5°C "is too high" and even the current 1.2°C, "if sustained, is likely to generate several meters of sea-level rise over the coming centuries, causing extensive loss and damage to coastal populations and challenging the implementation of adaptation measures."
"To avoid this requires a global mean temperature that is cooler than present and which we hypothesize to be closer to +1°C above preindustrial, possibly even lower, but further work is urgently required to more precisely determine a 'safe limit' for ice sheets," the paper states, referring to Antarctica and Greenland's continental glaciers.
Co-author Jonathan Bamber told journalists that "what we mean by safe limit is one which allows some level of adaptation, rather than catastrophic inland migration and forced migration, and the safe limit is roughly 1 centimeter a year of sea-level rise."
"If you get to that, then it becomes extremely challenging for any kind of adaptation, and you're going to see massive land migration on scales that we've never witnessed in modern civilization," said the University of Bristol professor.
In terms of timing, study lead author Chris Stokes, from the United Kingdom's Durham University, said in a statement that "rates of 1 centimeter per year are not out of the question within the lifetime of our young people."
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There are currently around 8.18 billion people on the planet. The study—funded by the United Kingdom's Natural Environment Research Council—says that "continued mass loss from ice sheets poses an existential threat to the world's coastal populations, with an estimated 1 billion people inhabiting land less than 10 meters above sea level and around 230 million living within 1 meter."
"Without adaptation, conservative estimates suggest that 20 centimeters of [sea-level rise] by 2050 would lead to average global flood losses of $1 trillion or more per year for the world's 136 largest coastal cities," says the study, also co-authored by University of Wisconsin-Madison professor Andrea Dutton and University of Massachusetts Amherst's Rob DeConto in the United States.
DeConto said Tuesday that "it is important to stress that these accelerating changes in the ice sheets and their contributions to sea level should be considered permanent on multigenerational timescales."
"Even if the Earth returns to its preindustrial temperature, it will still take hundreds to perhaps thousands of years for the ice sheets to recover," the professor explained. "If too much ice is lost, parts of these ice sheets may not recover until the Earth enters the next ice age. In other words, land lost to sea-level rise from melting ice sheets will be lost for a very, very long time. That's why it is so critical to limit warming in the first place."
Not really a surprise We are already committed to a 12m+ sea-level rise, sufficient to drown every coastal town and city on the planet The only question is how long will this take www.theguardian.com/environment/...
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— Prof Bill McGuire (@profbillmcguire.bsky.social) May 20, 2025 at 7:50 AM
While the paper sparked some international alarm, Stokes highlighted what he called "a reason for hope," which is that "we only have to go back to the early 1990s to find a time when the ice sheets looked far healthier."
"Global temperatures were around 1°C above preindustrial back then, and carbon dioxide concentrations were 350 parts per million, which others have suggested is a much safer limit for planet Earth," he said. "Carbon dioxide concentrations are currently around 424 parts per million and continue to increase."
The new paper continues an intense stream of bleak studies on the worsening climate emergency, and specifically, looming sea-level rise. Another, published by the journal Nature in February, shows that glaciers have lost an average of 273 billion metric tons of ice annually since 2000.
Despite scientists' warnings, the government whose country is responsible for the largest share of historical planet-heating emissions, the United States, is actually working to boost the fossil fuel industry. Upon returning to office in January, U.S. President Donald Trump declared an "energy emergency" and ditched the Paris agreement.
Responding to the new study on social media, Scottish ecologist Alan Watson Featherstone called out both the U.S. and U.K. governments. He said that with many countries "scaling back their already meager and [totally] inadequate actions to address climate breakdown, our present-day human culture is on a suicide course."
A dangerous initiative smuggles in a blatantly imperial and morally bankrupt agenda in a grotesque attempt to curry favor with a nationalist and climate-denying American right.
On the heels of a new United Nations report finding that over 150 “unprecedented” floods, heatwaves, hurricanes, and other climate disasters struck in 2024, the Council on Foreign Relations has launched its new “Climate Realism Initiative.” The Initiative’s goals proffer a dangerous and ahistorical set of climate politics, washing the United States’ hands of any responsibility to clean up global emissions or cooperate internationally to prevent the catastrophic impacts of 3°C of warming.
In a recent article branding the Initiative, CFR fellow Varun Sivaram shamelessly lays out the three main pillars of so-called “climate realism”: (1) that the world will overshoot the Paris agreement’s target to limit warming to 1.5 and even 2°C, (2) that the U.S. should eschew its own emissions reductions in favor of investing domestically in new clean technologies that can compete globally, and (3) that the U.S. should lead international efforts to avert catastrophic climate change.
In light of the first and second, the hypocrisy of CFR’s third pillar is particularly absurd.
CFR’s agenda is as tone-deaf as it is without bearing in history, science, or morality.
On the first pillar, Sivaram argues we should simply accept and prepare for a world with 3°C of warming—his so-called “realism”—but doesn’t stop to share what such a “real” world would look like.
At 3°C, 3.25 billion people will be exposed to lethal heat and humidity every year. The number of people globally who lack sufficient access to water will double. The majority of coral reefs will die. Sea levels will rise, threatening low-lying islands like the Marshall Islands in the Pacific and coastal cities like Bangkok, Shanghai, Amsterdam, and New Orleans. Agricultural yields will tumble, with most crops across the world suffering.
Perhaps most terrifying, the risk of hitting irreversible and catastrophic climate tipping points—like the wholesale dying off of the Amazon or melting of the Arctic—significantly increases.
Stepping back for a moment, it’s important to remember that the Paris agreement’s 1.5°C target came to be because frontline countries demanded such a target. With the Global North coalescing around 2°C ahead of COP21 in Paris and anything more ambitious thus thought politically infeasible, small island countries stunned many observers in leading more than 100 countries in demanding “1.5°C to stay alive.” Such a target, many, like the Marshall Islands’ Tina Stege, argue is necessary to avoid inundating and erasing island nations and low-lying places across the world.
Yet, rich countries in the Global North—and notably the U.S.—have too often ignored these calls in favor of a target that enables the continued extraction and burning of fossil fuels, prioritizes profits today over catastrophe tomorrow, and maintains the enormous wealth gap between Global North and South. By arguing that the U.S. should cast off the world’s 1.5°C and even 2°C target, Sivaram simultaneously condemns the Global South to a future with catastrophic and irreversible warming, a world without islands, where the Marshall Islands as we know them simply cease to exist.
It is within this context, then, that Sivaram advances the Initiative’s second pillar by presenting the following chart. With it, he argues that reducing U.S. emissions won’t make a meaningful difference because they’re a small share of projected future total global emissions.
However, in so doing, Sivaram ignores—even obfuscates—historical emissions. Consider a different chart, this one from Climate Watch, which illustrates the U.S.’ and the broader Global North’s role in creating the climate crisis in the first place. Looking back to the late 1800s, the U.S. and the European Union are responsible for over 50% of historical global greenhouse emissions (in CO2e).
In contrast, Small Island Developing States (SIDS)—a group of 39 island nations, including the Marshall Islands, across the Caribbean, Pacific, Atlantic, Indian Ocean, and South China Sea—have collectively contributed less than 1% of global emissions. Yet, SIDS and their nearly 65 million inhabitants are on the frontlines of the climate crisis, threatened by intensifying hurricanes and cyclones, shrinking biodiversity, and rising seas that threaten to swallow them whole.
Thus, Sivaram’s imperial assertion that U.S. emissions aren’t relevant to a “climate realism” agenda ignores what climate justice advocates have been raising for decades: that those most responsible for climate change should, in turn, be most responsible for addressing it. Instead, Sivaram offers an ahistorical perspective on emissions in service of uncapped emissions and U.S. exemption from climate accountability.
And then, finally, Sivaram offers his astoundingly contradictory final pillar: that the U.S. should lead efforts to avert catastrophic climate change. With the U.S. already a historic laggard and obstructionist in global climate negotiations, it’s hard to imagine a world in which the U.S. could possibly be seen to lead on climate while ignoring its own emissions reductions and sacrificing broad swaths of the Global South to sea-level rise, deadly heatwaves, and cascading crises driven by climate.
CFR’s agenda is as tone-deaf as it is without bearing in history, science, or morality. This dangerous initiative is anything but realistic, instead smuggling in a blatantly imperial and morally bankrupt agenda in a grotesque attempt to curry favor with a nationalist and climate-denying American right.
The climate movement must swiftly denounce this agenda and work toward one that aims to avoid overshoot at all costs, repair historic injustice, and uphold the value and dignity of human life across the globe.
One researcher said the findings support calls "for urgent and concrete actions to reduce greenhouse gas emissions and associated warming."
An international science project on Wednesday published a study in the journal Nature showing that glaciers have lost an average of 273 billion metric tons of ice annually since 2000—depleting freshwater resources, driving sea-level rise, and underscoring the need for sweeping global action to significantly reduce planet-heating pollution.
The Glacier Mass Balance Intercomparison Exercise (GlaMBIE) team compiled major studies to estimate global mass change from 2000, when glaciers—excluding Antarctica and Greenland's ice sheets—held about 121,728 billion metric tons of ice, to 2023.
The researchers found that during that period, the world lost 5% of all glacier ice, with regional losses for the full two decades ranging from 2% on the Antarctic and Subantarctic islands, to 39% in Central Europe.
That's a loss of 6,542 billion metric tons total or 273 billion metric tons per year, "the equivalent of three Olympic swimming pools per second," noted France's National Center for Scientific Research (CNRS).
Glaciologist Michael Zemp, who co-led the study, said in a statement that the annual figure "amounts to what the entire global population consumes in 30 years, assuming three liters per person and day."
"Every tenth of a degree warming that we avoid saves us money, saves us lives, saves us problems."
Although the researchers highlighted the annual average, they also emphasized that the rate of glacier ice loss "increased significantly" from 231 billion metric tons annually during the first half of the study period to 314 billion metric tons per year in the second half. In other words, the amount of ice being lost surged by 36% between the two ranges.
Zemp, a professor at Switzerland's University of Zurich and director of the World Glacier Monitoring Service, toldAgence France-Presse that the findings are "shocking" and warned that many smaller glaciers "will not survive the present century."
Stephen Plummer, an Earth observation applications scientist at the European Space Agency, said that "these findings are not only crucial for advancing our scientific understanding of global glacier changes, but also provide a valuable baseline to help regions address the challenges of managing scarce freshwater resources and contribute to developing effective mitigation strategies to combat rising sea level."
The ice loss over the GlaMBIE study's full timeline led to about 18 mm or 0.7 inches of sea-level rise. The researchers projected future losses that lead to 32-67 mm, or 1.26-2.6 inches, of sea-level rise by 2040.
"We are facing higher sea-level rise until the end of this century than expected before," Zemp told AFP, referring to the latest projection from the United Nations Intergovernmental Panel on Climate Change (IPCC).
"You have to reduce the greenhouse gas emissions, it is as simple and as complicated as that," Zemp said. "Every tenth of a degree warming that we avoid saves us money, saves us lives, saves us problems."
The GlaMBIE project manager, Samuel Nussbaumer, similarly toldOceanographic, that "our observations and recent modeling studies indicate that glacier mass loss will continue and possibly accelerate until the end of this century," which underpins the IPCC's "call for urgent and concrete actions to reduce greenhouse gas emissions and associated warming to limit the impact of glacier wastage on local geohazards, regional freshwater availability, and global sea-level rise."
The team's findings were released during the U.N.'s International Year of Glaciers' Preservation and the Decade of Action for Cryospheric Sciences—and they "will feed into the next IPCC report, due in 2029," according to CNRS.
Scientists from around the world who were not involved with the study were alarmed by its revelations—which come after the hottest year in human history and amid humanity's failure to curb planet-heating emissions, largely from fossil fuels.
Martin Siegert, a professor at the United Kingdom's University of Exeter, said in a statement that "this research is concerning to us, because it predicts further glacier loss, which can be considered like a 'canary in the coal mine' for ice sheet reaction to global warming and far more sea-level rise this century and beyond. The IPCC indicates 0.5-1 meters this century—but that is with a 66% certainty—hence 1/3 chance it could be higher under 'strong' warming, which unfortunately is the pathway we are on presently."
Andrew Shepherd, a professor at Northumbria University, another U.K. institution, explained that "glacier melting has two main impacts; it causes sea-level rise and it disrupts the water supply in rivers that are fed by meltwater."
"Around 2 billion people depend on meltwater from glaciers and so their retreat is a big problem for society—it's not just that we are losing them from our landscape, they are an important part of our daily lives," he said. "Even small amounts of sea-level rise matter because it leads to more frequent coastal flooding. Every centimeter of sea-level rise exposes another 2 million people to annual flooding somewhere on our planet."