In the last 10,000 years, the Greenland Ice Sheet shrank to its smallest size around 3,000 to 5,000 years ago, when ocean temperatures were also quite high, a new study suggests. Understanding the reaction ice sheets like the ones covering Greenland and Antarctica will have to climate change is important because the melting ice could contribute significantly to rising sea levels. "We're particularly concerned about what the ice sheets are going to do, because when they melt, sea levels rise," said study co-author Jason Briner, a geologist at the University at Buffalo. One way to make predictions about the current warming period is to see how warming trends in the past affected the ice sheet, and the rivers of ice called glaciers that make them up.
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