About 400,000 years ago, large parts of Greenland were ice-free. At that time, Earth and its early humans were going through one of the longest interglacial periods since ice sheets first covered the high latitudes 2.5 million years ago. The drilling took place at Camp Century, one of the military's most unusual bases – it was nuclear powered and made …
Plant fossils, twigs and leaves have been discovered under a mile of ice on Greenland, suggesting the area was free of ice within the last million years. But a new study shows that within the last million years it melted off and became covered with green tundra, perhaps like this view of eastern Greenland, on the coast near the ocean …
