Greenland Ice Sheet (IMAGE)
Caption
Scientists were greatly surprised to discover an ancient tundra landscape preserved under the center of the Greenland Ice Sheet, below two miles of ice. "We found organic soil that has been frozen to the bottom of the ice sheet for 2.7 million years," said University of Vermont geologist Paul Bierman -- providing strong evidence that the Greenland Ice Sheet has persisted much longer than previously known, enduring through many past periods of global warming. Bierman led an international team of scientists that reported their discovery on April 17 in the journal Science.
Credit
Joshua Brown, 2012
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