Greenland melted some 416,000 years ago, shows high risk of causing sea level rise today
A large portion of Greenland melted about 416,000 years ago—perhaps a bit like the modern Greenland landscape shown in this photo—and became ice-free tundra, or boreal forest, a new study in the journal Science shows. The results help overturn a previous view that much of the Greenland ice sheet persisted for most of the last two and a half million years. Instead, moderate warming, from 424,000 to 374,000 years ago, led to dramatic melting. This finding…