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sea ice
'Changes in the Heart of Winter': NOAA Report Documents Warmest Arctic Year on Record
"After 20 years of continuous reporting, the Report Card stands as a chronicle of change and a caution for what the future will bring," report contributors said.
Dec 17, 2025
The Arctic just experienced its warmest air temperatures on record between October 2024 and September 2025 as the climate crisis dramatically alters the region, the National Oceanic and Atmospheric Administration found in its 20th Arctic Report Card.
The annual report, released Tuesday, also notes the Arctic's lowest maximum sea-ice extent and its wettest year on record. The past 10 years have been the warmest recorded in a region that is heating at two to four times the global average.
"After 20 years of continuous reporting, the Report Card stands as a chronicle of change and a caution for what the future will bring," report editors Matthew Langdon Druckenmiller, Rick Thoman, and Twila A. Moon wrote in the executive summary. "Transformations over the next 20 years will reshape Arctic environments and ecosystems, impact the well-being of Arctic residents, and influence the trajectory of the global climate system itself, which we all depend on."
Arctic warming is not confined to the spring and summer months, but marks a full-year transformation, with fall 2024 being the warmest Arctic fall on record and winter 2025 the second-warmest winter. While snow levels do remain high in the winter months, they consistently drop by June, with snow cover during that month now about half of 1960s levels. Precipitation in the winter months is also not limited to snow.
"We can point to the Arctic as a far away place but the changes there affect the rest of the world.”
At sea, ice extent is also shrinking in the winter, with March 2025 seeing the lowest maximum sea-ice extent in nearly 50 years of satellite data. The oldest, thickest ice has shrunk by over 95% since the 1980s, and its domain has constricted to areas north of Greenland and the Canadian archipelago.
“There’s been a steady decline in sea ice and unfortunately we are seeing rain now even in winter,” Druckenmiller told the Guardian. “We are seeing changes in the heart of winter, when we expect the Arctic to be cold. The whole concept of winter is being redefined in the Arctic.”
Warming temperatures are also driving changes in ecosystems, with more southern species and conditions shifting northward both on land and at sea. On land, this happens via the "greening" of the tundra and the spread of boreal species into the Arctic. At sea, warmer, saltier water is shifting north, driving the "Atlantification" of the Arctic, which exacerbates ice melt and threatens to destabilize ocean circulation patterns.
Changes are also occurring on the Pacific side of the Arctic Ocean, with Arctic species declining by two-thirds in the northern Bering Sea and one-half in the Chukchi Sea.
“We are no longer just documenting warming—we are witnessing an entire marine ecosystem transform within a single generation,” Hannah-Marie Ladd, director of the Indigenous Sentinels Network on the Aleut community of Saint Paul Island, said at a conference unveiling the report.
Ocean warming, the melting of glaciers, and melting permafrost are increasing weather hazards and other dangers for Arctic communities. For example, warm ocean temperatures fueled ex-Typhoon Halong in October 2025, which forced over 1,500 people to evacuate from Alaska's southwestern coast and nearly destroyed two villages.
Glacier melt has increased the risk of sudden flooding and landslides, while the melting of permafrost is leading to the phenomenon of "rusting rivers," as oxidized iron from melting permafrost enters the water and degrades water quality.
These impacts aren't limited to the Arctic. The Greenland ice sheet, for example, lost 129 billion tons of sea ice, which contributes to global sea-level rise.
“We are seeing cascading impacts from a warming Arctic,” Climate Central scientist Zack Labe told the Guardian. “Coastal cities aren’t ready for the rising sea levels, we have completely changed the fisheries in the Arctic, which leads to rising food bills for seafood. We can point to the Arctic as a far away place but the changes there affect the rest of the world.”
The report comes as the Trump administration has moved to censure federal climate scientists and cut staffing and funding for government science.
Outside researchers noted that the administration did not seem to have significantly altered the content of the 2025 Arctic Report Card.
“I honestly did not see much of a tone shift in comparison to previous Arctic report cards in years past, which was great to see,” Climate Central media director Tom Di Liberto told NBC News. “The implications of their findings are the same as past Arctic report cards. The Arctic is the canary in the coal mine.”
"The Trump administration’s cuts to budgets, staffing, and resources for science are already affecting data and research related to the Arctic."
Druckenmiller also told reporters that the team “did not receive any political interference with our results.”
However, the 2024 Arctic Report Card urged a "global reductions of fossil fuel pollution," in its subhead, an exhortation missing from the 2025 version.
The 2025 report did refer to the impacts of federal funding cuts, discussing "vulnerabilities and risks facing nationally and internationally coordinated observing programs, especially amid risks of diminishing US investments in climate and environmental observations," as Druckenmiller, Thoman, and Moon wrote.
"The Trump administration’s cuts to budgets, staffing, and resources for science are already affecting data and research related to the Arctic," the Union of Concerned Scientists (UCS) posted on social media in response to the release.
However, even if the report did not highlight the causes of the climate emergency, it's ultimate message was unmistakable, UCS said: "It’s clear that fossil fueled climate change is having an alarming effect on the vital signs of this unique, crucial region of the world."
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The Time Has Come to Establish the International Arctic Ocean Sanctuary
In addition to accelerating efforts to reduce global carbon emissions to reverse global warming, governments must urgently adopt strong, permanent protections for the entire Arctic Ocean.
Jun 08, 2025
On World Ocean Day, and the eve of the United Nations Ocean Conference in Nice, France opening Monday, the Arctic Ocean ecological crisis needs to be top of the list for attention by governments.
Given the well-documented, catastrophic decline of the Arctic Ocean sea ice ecosystem in recent decades due to climate change, coupled with the increasing threats and impacts from industry and military activity in the region, it is imperative that governments establish an International Arctic Ocean Sanctuary to preserve this extraordinary ecoregion as a global commons for peaceful, non-commercial, scientific purposes.
Covering approximately 5.4 million square miles, the Arctic Ocean is one of the most extraordinary and vibrant regions of the global ocean, and plays an important role regulating Earth’s climate.
Combined with the effects of climate change, industrialization and militarization would further accelerate the ecological and social collapse of the struggling Arctic Ocean region.
The Arctic marine ecosystem is globally unique, productive, and remains relatively unexplored. The ocean biome supports more than 7,000 identified species, many of which are found nowhere else on Earth—polar bears, walrus, several kinds of ice seals, narwhals, beluga whales, bowhead whales, some of the largest populations of seabirds in the world, and many unique fish and invertebrate populations. It hosts cold seeps, hydrothermal vents, stunning benthic habitats, a rich pelagic ecosystem that remains surprisingly active during winter darkness, and supports the subsistence cultures of coastal Indigenous Peoples.
However, this unique polar marine ecosystem is now one of the most endangered regions of Earth’s biosphere, suffering effects of climate change more severely than anywhere else. Arctic sea ice has declined by more than half in the last 50 years, losing about 1 million square miles in both summer and winter, has thinned from an average of four meters to about one meter, and could disappear entirely in summer by 2035. Multiyear sea ice has all but vanished. This remarkable decline has been caused by global carbon emissions from human activity, mainly fossil fuel use.
The loss of Arctic sea ice over the last half-century constitutes one of the largest declines in ecological habitat on Earth, rivaling the loss of tropical rainforests. The resultant Arctic Ocean ecological crisis is now severe, and predicted to get much worse in coming decades.
In addition to devastating impacts of climate change in the Arctic Ocean, commercial interests are clamoring to exploit ice-free offshore areas for oil and gas, methane hydrates, minerals, commercial fishing, shipping, and tourism. And Arctic coastal nations have made Extended Continental Shelf (ECS) seabed claims (pursuant to U.N. Law of the Sea, Article 76) beyond their 200-mile Exclusive Economic Zones (EEZs), a dangerous territorial expansion into international waters with an eye toward resource extraction.
As Arctic nations and others (China, India, etc.) advance their own parochial interests across the region, there is a growing competitive race to exploit Arctic offshore resources and to project military power across the region to secure these competing national interests. As such, the risk of military confrontation across the Arctic Ocean is escalating. Combined with the effects of climate change, industrialization and militarization would further accelerate the ecological and social collapse of the struggling Arctic Ocean region, and would clearly compromise the ability of the bioregion and its people to survive the 21st-century climate crisis.
In fact, the resource and political tensions in the Arctic Ocean today are remarkably similar to the Antarctic after World War II, that were resolved then by the leadership of U.S. (Republican) President Dwight D. Eisenhower proposing and negotiating the historic 1959 Antarctic Treaty. The international Treaty, now with 58 nation-state members, permanently protects the extraordinary 5.5 million square-mile Antarctic continent as a global commons for peaceful, scientific purposes, free from nuclear testing, military operations, economic exploitation, and territorial claims. The Antarctic Treaty remains the single greatest conservation achievement in history.
The same opportunity now presents itself with the Arctic Ocean. In addition to accelerating efforts to reduce global carbon emissions to reverse global warming, governments must urgently adopt strong, permanent protections for the entire Arctic Ocean to give this region and its people the best chance possible to survive the 21st-century climate crisis. Given the pace of decline, this may be our last best chance to do so.
While Arctic nations have begun protecting some areas off their coasts, still less than 5% of Arctic Ocean waters are in permanently protected status. This is clearly insufficient.
The proposed circumpolar Arctic Ocean Sanctuary must fully protect not only international waters beyond coastal state 200-mile EEZs across the 1.1 million square mile Central Arctic Ocean (as is currently proposed), but also the highly productive waters within the EEZs of Arctic coastal nations—Canada, Norway, Denmark and Greenland, Russia, and the U.S., where most ecological activity, human impact, and threat occurs. The sanctuary should permanently prohibit oil and gas leasing, mineral leasing, commercial fishing, military activities, improve shipping safety, reduce pollutants, and enhance scientific research.
To be sure, it is a big ask of the five Arctic coastal nations to contribute some of their claimed territory into a globally protected area, but this was the right thing to do in 1959 in the Antarctic, and it is the right thing to do now for the Arctic.
While the current federal administrations in the Russia and U.S. habitually oppose any and all environmental conservation proposals, perhaps presidents Vladimir Putin and Donald Trump might see this as a historic legacy in the midst of the environmental havoc they have caused, a chance to be remembered as Eisenhower is today for his leadership in negotiating the Antarctic Treaty. And just to note, former President Joe Biden ignored this request entirely, enacted no comprehensive permanent protections in the U.S. Arctic Ocean off Alaska, and made no effort to begin discussions on the International Arctic Ocean Sanctuary.
Global society has a historic choice to make with the imperiled Arctic Ocean. Should we continue our competitive industrial and military expansion into one of the last wild areas of the world, further degrading a region already unraveling due to human-caused climate change? Or should we protect and sustain this magnificent place for all time, giving it and its inhabitants, human and non-human, the best chance possible to recover from climate change this century?
How we answer this question will tell us a lot about ourselves and our future.
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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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