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Ice cores drilled for missile silo research reveal when Greenland was last green

Ice cores drilled for missile silo research reveal when Greenland was last green
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Ancient leaves lost in a freezer hold lessons on climate change

Ancient leaves lost in a freezer hold lessons on climate change
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Thanks to a secret Cold War project, researchers found fossilized plants 4,500 feet under Greenland's ice sheet

Thanks to a secret Cold War project, researchers found fossilized plants 4,500 feet under Greenland s ice sheet
insider@insider.com (Aria Bendix)
© Reuters/Lucas Jackson
Crevasses on top of the Helheim glacier near Tasiilaq, Greenland, on June 19, 2018. Reuters/Lucas Jackson
Greenland s ice sheet disappeared at least once in the last million years, a new study found.
The discovery came after fossilized plants were found deep below the ice.
The fossils were collected as part of a Cold War project but weren t analyzed until recently.
During the Cold War, US Army scientists planned to hide hundreds of nuclear warheads underneath the Greenland ice sheet in a covert mission known as Project Iceworm. ....

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Ancient leaves preserved under a mile of Greenland's ice – and lost in a freezer for years – hold lessons about climate change

In 1963, inside a covert U.S. military base in northern Greenland, a team of scientists began drilling down through the Greenland ice sheet. Piece by piece, they extracted an ice core 4 inches across and nearly a mile long. At the very end, they pulled up something else – 12 feet of frozen soil.
The ice told a story of Earth’s climate history. The frozen soil was examined, set aside and then forgotten.
Half a century later, scientists rediscovered that soil in a Danish freezer. It is now revealing its secrets.
Using lab techniques unimaginable in the 1960s when the core was drilled, we and an international team of fellow scientists were able to show that Greenland’s massive ice sheet had melted to the ground there within the past million years. Radiocarbon dating shows that it would have happened more than 50,000 years ago. It most likely happened during times when the climate was warm and sea level was high, possibly 400,000 years ago. ....

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