'Not a good sign': Study shows Greenland temperatures at 1,000-year high

Collecting core samples from the Greenland ice sheet is no easy task. During a recent expedition, scientists and drilling experts boarded a ski-equipped aircraft and flew to a site at an elevation of about 3,000 meters (9,800 feet) above sea level in central-north Greenland. Then they drilled into the ice sheet with special equipment and […]

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