DNA Reveals Greenland's Lush Past

In the region of Greenland, now covered with thick ice, armies of insects once crawled through lush forests. They extracted DNA from the ice cores and it showed moths and butterflies were living in forests of spruce and pine in the area between 450,000 and 800,000 years ago. They believe these DNAs are the oldest pure samples obtained. The ice cores also suggest that the ice sheet is more resistant to warming than previously thought according to the scientists.