Armies of insects once crawled through lush forests in a region of Greenland now covered by more than 2000m of ice.DNA extracted from ice cores show that moths and butterflies were living in forests of spruce and pine in the area between 450,000 and 800,000 years ago.
Writing in the journal Science, the researchers say they believe the DNAs are the oldest pure samples obtained.
The ice cores also suggest that the ice sheet is more resistant to warming than previously thought, the scientists say.
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