Tundra Shrubs Turn into Trees as Arctic Warms

LiveScience: Tundra is by definition a cold, treeless landscape. But scientists have found that in a part of the Eurasian Arctic, willow and alder shrubs, once stunted by harsh weather, have been growing upward to the height of trees in recent decades. The reason for the change: the warming Arctic climate, they say. Roughly 30 years ago, trees were nearly unknown there. Now, 10 percent to 15 percent of the land in the southern part of the northwestern Eurasian tundra, which stretches between Finland and...

URL: http://www.msnbc.msn.com/id/47666209