Arctic Jungle

A 1,034-foot core sample of an Arctic lake shows that, about 3 million years ago, the Arctic was about 14 degrees warmer than it is now, rainier, and covered with Douglas fir and hemlock, which in turn shows that our current models of how much the Earth may heat up may be underestimating the change: http://www.csmonitor.com/Science/2013/0509/Ancient-Arctic-was-warm-wet-and-green.-What-that-says-about-the-future