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The Doomsday Glacier is on the brink of collapse, and when it does, it could cause a global catastrophe.
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That's the warning from scientists who say the glacier, which sits on the west coast of Greenland, is being held back by just a few remaining "fingernails."
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If those nails were to give way, the glacier would release a massive amount of water into the Atlantic Ocean, resulting in a rise in sea level of up to 20 feet (6 meters).
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The Doomsday Glacier is just one of many glaciers in Greenland that are melting at an accelerating rate due to climate change.
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While the collapse of the glacier would be catastrophic, it's not likely to happen overnight.
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"It's not going to be like the movies, where the glacier suddenly calves and the tsunami wipes out New York City," said Branden Studeny,
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A glaciologist at NASA's Goddard Space Flight Center. "It will be a slow-motion disaster."
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The Doomsday Glacier is one of the largest glaciers in Greenland, and its collapse would have far-reaching consequences.
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"If the Doomsday Glacier were to collapse, it would be an environmental disaster of global proportions," said David Holland.
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Holland said the rise in sea level from the glacier's collapse would be enough to inundate coastal cities around the world, including New York, London, and Shanghai.
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"This would be a global disaster that would dwarf any other in human history," he said.
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