A mile-thick ice sheet in Greenland vanished around 416,000 years ago during a period of moderate natural warming, driving global sea rise to levels that would spell catastrophe for coastal regions today, a study said Thursday.
The results overturn a long-held view that the world's largest island was an impregnable fortress of ice over the past 2.
"And the only way to do that at Camp Century is to remove a mile of ice," said Tammy Rittenour, a co-author of the study at Utah State University."Plus, to have plants, you have to have light." Inside the quartz from the Camp Century core, rare forms – called isotopes – of the elements beryllium and aluminum build up when the ground is exposed to the sky and cosmic rays.
This took place in a time of natural warming called an interglacial period, when temperatures were similar to today, around 1.8-2.7 degrees Fahrenheit warmer than the pre-industrial era.
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