Much of Greenland's ice melted about 400,000 years ago, adding 5 feet to sea levels: study
While previous work has estimated that the ice on Greenland melted at least once in the last 1.1 million years, the researchers behind this latest study say much of the territory was in fact green 416,000 years ago, plus or minus 38,000 years.
Although the nuclear missile mission was a "bust," the researchers say the scientists there at the time drilled down almost a mile deep, collecting 12 feet of soil and rock from below the ice. By measuring the number of electrons that are released, the scientists could determine when the sediment was last exposed to the sun.
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