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glaciers
Scientists Warn Major Glaciers Won't 'Survive This Century,' With Grave Impacts for Billions
"Preservation of glaciers is not just an environmental, economic, and societal necessity," said one expert. "It's a matter of survival."
Mar 21, 2025
Scientists on Friday spent the United Nations' World Water Day and first-ever World Day for Glaciers warning about how fossil fuel-driven global warming melts ice across the planet, endangering freshwater resources and causing seas to rise, with implications for ecosystems, economies, and billions of people.
In a Friday statement, World Meteorological Organization Secretary-General Celeste Saulo pointed to a publication that the U.N. agency released earlier this week: "WMO's State of the Global Climate 2024 report confirmed that from 2022-224, we saw the largest three-year loss of glaciers on record."
"Seven of the 10 most negative mass balance years have occurred since 2016," Saulo continued. "Preservation of glaciers is not just an environmental, economic, and societal necessity. It's a matter of survival."
The WMO report was followed by the Friday launch of a 174-page document from the United Nations Educational, Scientific, and Cultural Organization (UNESCO) that stresses how "billions of people depend on the fresh water that flows from increasingly fragile mountain environments."
"As the water towers of the world, mountains are an essential source of fresh water for (irrigated) agriculture, power generation, industry, and large and growing populations—in the mountains and also downstream," the report details. "Generally, due to higher precipitation and lower evaporation, mountains supply more surface runoff per unit area than lowlands, providing 55-60% of global annual freshwater flows."
The document, The United Nations World Water Development Report 2025—Mountains and glaciers: Water towers, notes that "major cities that have been critically dependent on mountain waters include Addis Ababa, Barcelona, Bogotá, Jakarta, Kathmandu, La Paz, Lima, Los Angeles, Melbourne, Mexico City, New Delhi, New York, Quito, Rio de Janeiro, and Tokyo."
"Globally, up to two-thirds of irrigated agriculture may depend on mountain waters," the report states, "while the number of people in lowlands that strongly depend on water from mountains increased worldwide from around 0.6 billion in the 1960s to some 1.8 billion in the 2000s. An additional 1 billion people in the lowlands benefit from supportive mountain runoff contributions."
"Most of the world's glaciers, including those in mountains, are melting at an accelerated rate worldwide," the publication adds. "Combined with accelerating permafrost thaw, declining snow cover, and more erratic snowfall patterns... this will have significant and irreversible impacts on local, regional, and global hydrology, including water availability."
“The 21st of March 2025 is being celebrated as the first-ever World Day for Glaciers. ‘Celebrate’? Yes, we should celebrate glaciers and their crucial role in sustaining life on Earth for future generations,” says @iceblogger.bsky.social. Great stats here on the importance of glaciers 🧊
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— Covering Climate Now (@coveringclimatenow.org) March 21, 2025 at 8:31 AM
The UNESCO publication follows the international Glacier Mass Balance Intercomparison Exercise (GlaMBIE) team's study, published in the journal Nature last month, showing that glaciers have lost an average of 273 billion metric tons of ice annually since 2000.
That figure "amounts to what the entire global population consumes in 30 years, assuming three liters per person and day," Michael Zemp, a professor at Switzerland's University of Zurich and director of the World Glacier Monitoring Service who co-led the GlaMBIE study, explained at the time.
Zemp pointed to that finding and others on Friday, noting that from 2000-23, glacier melt caused global seas to rise 18 mm or about 0.7 inches. He said, "This might not sound much, but it has a big impact: Every millimeter [of] sea-level rise exposes an additional 200,000 to 300,000 people to annual flooding."
In a U.N. video, experts also highlighted parts of the globe that are particularly impacted by melting glaciers. Zemp explained that in "the European Alps, we are one of the regions that is most affected by climate change. Warming is about double the global average, and indeed, glaciers in the Alps are one of the most suffering around the world."
"We have lost, since 2000, almost 40% of the remaining ice. And that means under current melt rates, glaciers will not survive this century in the Alps," he warned.
Today is the first-ever #WorldGlaciersDay! Glaciers provide water for millions of people, regulate sea levels, and support biodiversity. Yet glaciers are disappearing at an alarming rate. #ClimateAction is key to protecting them & supporting those who rely on glaciers. www.un.org/en/observanc...
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— IngerAndersen.bsky.social (@ingerandersen.bsky.social) March 21, 2025 at 9:57 AM
Scientists are also concerned about the Hindu Kush in the Himalayas, which are often called the "third pole because they hold a lot of water resources," WMO's Sulagna Mishra said in the video. "Here, more than 120 million farmers in the downstream areas are impacted directly because of the melting of the glaciers."
"So, when there are a lot of floods, for example, happening because of melting of glaciers, the livelihoods are changed, people tend to migrate from one place to another," she continued. "So when you ask me how many people are actually impacted, it's really everyone."
As Carbon Briefreported Friday:
Dr. Aditi Mukherji—the director of the climate change, adaptation, and mitigation impact action platform of the CGIAR—tells Carbon Brief that the report is an important call for more "adaptation efforts and funding."
She says that mountain-dwelling communities are "already quite vulnerable due to their remote location and other developmental deficits" and are "increasingly losing their way of life due to no fault of theirs."
However, in some parts of the world, especially the United States, such calls face the pro-fossil fuel agenda of polluting companies and right-wing policymakers that are working to quash the movement for a just transition to clean energy by any means necessary.
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'Grim News for the Planet' as Arctic Sea Ice Hits Record Low
"The environment does not care about politics. Keep spewing greenhouse gases and face the consequences."
Mar 06, 2025
European Union officials said the Copernicus Climate Change Service had issued its latest "stark reminder of why climate action is urgent" when the bloc's program announced that it observed less sea ice covering the Earth's oceans last month than at any other point in recorded history.
In the Arctic, sea ice reached its lowest monthly extent on record, at 8% below average, in early February, and it remained below the previous record for the rest of the month.
The oceans were missing an area of ice roughly the size of the United Kingdom last month, according to Copernicus (C3S), and the finding was not an anomaly in recent sea ice observations.
February marked the third consecutive month in which record low sea ice levels for the corresponding month were observed in the Arctic.
C3S reported that in the Antarctic, sea ice levels have rapidly declined in 2025 after appearing to recover to near-record levels in December 2024.
Last month, sea ice near the South Pole reached its fourth-lowest monthly extent, at 26% below average.
C3S said the daily sea ice extent in the Antarctic may have also reached its annual minimum toward the end of the month, which will be confirmed later in March; if confirmed, it would be the second-lowest annual minimum in the satellite record.
"February 2025 continues the streak of record or near-record temperatures observed throughout the last two years," said Samanatha Burgess, strategic lead for climate at the European Center for Medium-Range Weather Forecasts. "One of the consequences of a warmer world is melting sea ice, and the record or near-record low sea ice cover at both poles has pushed global sea ice cover to an all-time minimum."
The melting sea ice was recorded as global average temperatures rose 1.59°C (2.8°F) above the pre-industrial average last month, making it the third-warmest February on record.
In Europe, the temperatures that most exceeded averages were recorded last month in parts of Scandinavia, Iceland, and the Alps. Outside of Europe, "temperatures were most above average over large parts of the Arctic."
The low extent of sea ice will lead to "more solar heat absorbed by the darker oceans," and "faster warming," said Simon Oldridge, a climate campaigner.
The loss of sea ice can also lead to the collapse of ocean currents that are crucial for marine life to thrive.
C3S reported on the record-low sea ice levels as campaigners in the U.S. and around the world condemned recent anti-climate actions taken by U.S. President Donald Trump and the Republican Party, including the country's exit from the Paris climate agreement, the GOP's passing of a bill to end a federal program aimed at reducing planet-heating methane emissions, and Trump's push to fast-track fossil fuel projects—as scientists warn that new extractive projects have no place on a pathway to limiting planetary heating and avoiding its worst impacts.
"The environment does not care about politics," said public health expert Ali Khan. "Keep spewing greenhouse gases and face the consequences."
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Study Shows Glaciers Have Lost '3 Olympic Swimming Pools Per Second' Since 2000
One researcher said the findings support calls "for urgent and concrete actions to reduce greenhouse gas emissions and associated warming."
Feb 20, 2025
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."
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