Microfossil willow wood, fungi, insect body parts, and a poppy seed have been recovered from sediments at the bottom of central Greenland’s two-mile-long GISP2 ice core.^1,2 This find is similar to an earlier discovery of such fossils found in basal sediments from the Camp Century ice core near Greenland’s northwest coast.³ These microfossils suggest that Greenland once had a tundra-like environment, with grasses but few trees. Because plants cannot grow directly in ice, this find greatly strengthens the argument that much of Greenland was ice-free relatively...