Climate Change Is Shrinking Glaciers Faster Than Ever, with 7 Trillion Tons Lost Since 2000 

This photograph shows the Rhone Glacier and its glacial lake, formed by the melting of the glacier, above Gletsch, in the Swiss Alps on September 30, 2024. (AFP)
This photograph shows the Rhone Glacier and its glacial lake, formed by the melting of the glacier, above Gletsch, in the Swiss Alps on September 30, 2024. (AFP)
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Climate Change Is Shrinking Glaciers Faster Than Ever, with 7 Trillion Tons Lost Since 2000 

This photograph shows the Rhone Glacier and its glacial lake, formed by the melting of the glacier, above Gletsch, in the Swiss Alps on September 30, 2024. (AFP)
This photograph shows the Rhone Glacier and its glacial lake, formed by the melting of the glacier, above Gletsch, in the Swiss Alps on September 30, 2024. (AFP)

Climate change is accelerating the melting of the world's mountain glaciers, according to a massive new study that found them shrinking more than twice as fast as in the early 2000s.

The world's glaciers lost ice at the rate of about 255 billion tons (231 billion metric tons) annual from 2000 to 2011, but that quickened to about 346 billion tons (314 billion metric tons) annually over about the next decade, according to the study in this week’s journal Nature.

And the last few years, the melt has accelerated even more, hitting a record 604 billion tons (548 billion metric tons) lost in 2023, the last year analyzed.

The study drew on an international effort that included 233 estimates of changes in glacier weight. In all, the world's glaciers have lost more than 7 trillion tons of ice (6.5 trillion metric tons) since 2000, according to the study.

“The thing that people should be aware of and perhaps worried about is that yes, the glaciers are indeed retreating and disappearing as we said they would. The rate of that loss seems to be accelerating,” said William Colgan, a glaciologist for the Geological Survey of Denmark and Greenland and one of about 60 authors of the study.

Glaciers in Alaska are melting at the fastest rate of any of the 19 regions studied, losing about 67 billion tons (61 billion metric tons) of ice a year, producing the biggest net ice loss, the study found.

In the past 24 years, Central Europe’s glaciers have lost the highest percentage of ice of any region, now 39% smaller than they were in 2000, the paper said. Colgan said he worries most about the Alps because “elevated summer temperatures have been hammering the Alps.”

Fifteen years ago, scientists were worried most about the Andes and the Patagonia glaciers, but the Alps have shrunk so fast they could eventually disappear, Colgan said.

“Glaciers are apolitical and unbiased sentinels of climate change, and their decline paints a clear picture of accelerated warming,” said Gwenn Flowers, a professor of Earth Sciences at Simon Fraser University in Canada, who wasn't part of the study.

University of Colorado ice scientist Ted Scambos, who also wasn't part of the study, said glaciers shrank and grew in the past for local, well-understood reasons that were not climate change. What's happening now is different and clear.

“It’s due to greenhouse gas increases caused directly by coal, oil, and natural gas burning. ... No amount of rhetoric, tweeting, or proclamation will change that,” he said.

Scambos, Flowers and other outside scientists called the assessment sobering and accurate but not surprising.

Colgan said that many places — such as those in the US West — are seeing extra water now from fast-melting glaciers and benefiting from that boost, but that will soon disappear as the glaciers melt beyond a point of no return.

Melting glaciers contribute more to sea level rise than ice loss in either Greenland or Antarctica. Only the expansion of water as it warms plays a bigger role in sea level rise, the paper said.

The overall glacier loss rate is similar, if maybe slightly less, than that found by earlier and less comprehensive studies. But this new work will probably trigger new predictions that will be even gloomier in the future because of better information and worsening warming, Colgan said.

“If you’re losing 5.5% of the global ice volume in just over 20 years, clearly that’s not sustainable,” Colgan said. “That's going to catch up with you.”

The more than 600 billion tons of glacier loss in 2023 “sounds incredible now, but it might sound pretty normal in 10 years from now,” Colgan said. “Mountain glaciers as a whole can flip into collective ice loss pretty darn quick.”



Biggest Piece of Mars on Earth is Going Up for Auction in New York

A Martian meteorite, weighing 54.388 lbs. (24.67 kg), said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York, Wednesday, July 9, 2025, part of their Geek Week auction, July 16, 2025. (AP Photo/Richard Drew)
A Martian meteorite, weighing 54.388 lbs. (24.67 kg), said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York, Wednesday, July 9, 2025, part of their Geek Week auction, July 16, 2025. (AP Photo/Richard Drew)
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Biggest Piece of Mars on Earth is Going Up for Auction in New York

A Martian meteorite, weighing 54.388 lbs. (24.67 kg), said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York, Wednesday, July 9, 2025, part of their Geek Week auction, July 16, 2025. (AP Photo/Richard Drew)
A Martian meteorite, weighing 54.388 lbs. (24.67 kg), said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York, Wednesday, July 9, 2025, part of their Geek Week auction, July 16, 2025. (AP Photo/Richard Drew)

For sale: A 54-pound (25-kilogram) rock. Estimated auction price: $2 million to $4 million. Why so expensive? It's the largest piece of Mars ever found on Earth.

Sotheby's in New York will be auctioning what's known as NWA 16788 on Wednesday as part of a natural history-themed sale that also includes a juvenile Ceratosaurus dinosaur skeleton that's more than 6 feet (2 meters) tall and nearly 11 feet (3 meters) long, The Associated Press reported.

According to the auction house, the meteorite is believed to have been blown off the surface of Mars by a massive asteroid strike before traveling 140 million miles (225 million kilometers) to Earth, where it crashed into the Sahara. A meteorite hunter found it in Niger in November 2023, Sotheby's says.

The red, brown and gray hunk is about 70% larger than the next largest piece of Mars found on Earth and represents nearly 7% of all the Martian material currently on this planet, Sotheby's says. It measures nearly 15 inches by 11 inches by 6 inches (375 millimeters by 279 millimeters by 152 millimeters).

"This Martian meteorite is the largest piece of Mars we have ever found by a long shot," Cassandra Hatton, vice chairman for science and natural history at Sotheby's, said in an interview. "So it´s more than double the size of what we previously thought was the largest piece of Mars."

It is also a rare find. There are only 400 Martian meteorites out of the more than 77,000 officially recognized meteorites found on Earth, Sotheby's says.

Hatton said a small piece of the red planet remnant was removed and sent to a specialized lab that confirmed it is from Mars. It was compared with the distinct chemical composition of Martian meteorites discovered during the Viking space probe that landed on Mars in 1976, she said.

The examination found that it is an "olivine-microgabbroic shergottite," a type of Martian rock formed from the slow cooling of Martian magma. It has a course-grained texture and contains the minerals pyroxene and olivine, Sotheby's says.

It also has a glassy surface, likely due to the high heat that burned it when it fell through Earth's atmosphere, Hatton said. "So that was their first clue that this wasn't just some big rock on the ground," she said.

The meteorite previously was on exhibit at the Italian Space Agency in Rome. Sotheby's did not disclose the owner.

It's not clear exactly when the meteorite hit Earth, but testing shows it probably happened in recent years, Sotheby's said.

The juvenile Ceratosaurus nasicornis skeleton was found in 1996 near Laramie, Wyoming, at Bone Cabin Quarry, a gold mine for dinosaur bones. Specialists assembled nearly 140 fossil bones with some sculpted materials to recreate the skeleton and mounted it so it's ready to exhibit, Sotheby's says.

The skeleton is believed to be from the late Jurassic period, about 150 million years ago, Sotheby's says. It's auction estimate is $4 million to $6 million.

Ceratosaurus dinosaurs were bipeds with short arms that appear similar to the Tyrannosaurus rex, but smaller. Ceratosaurus dinosaurs could grow up to 25 feet (7.6 meters) long, while the Tyrannosaurs rex could be 40 feet (12 meters) long.

The skeleton was acquired last year by Fossilogic, a Utah-based fossil preparation and mounting company.

Wednesday's auction is part of Sotheby's Geek Week 2025 and features 122 items, including other meteorites, fossils and gem-quality minerals.