Ian Joughin is a glaciologist at the University of Washington in Seattle, Washington.
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12:08
Antarctic Ice Sheet Slipping Into the Sea
Scientists confirmed a West Antarctic ice sheet the size of the Dakotas is melting.
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11:36
Greenland’s Fast-Moving Glacier Speeds Up
The Jakobshavn glacier reached speeds of more than 150 feet per day during the summer of 2012.