When the climate began to warm during the last Ice Age about 23,000 years ago, much of the Northern Hemisphere was covered I in ice.

In two new studies published this week in Nature Geoscience, researchers describe how ice sheets behaved in the past could help scientists better predict what might happen to them in a warmer world of our future.          

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University of Wisconsin geologist Anders Carlson studies ice sheet melt from land and ocean sediment cores. His study describes what prehistoric Earth was like in North America and Northern Europe some 140,000 years ago.