Since the late 1990s, climate change has driven a massive expansion of forest-destroying Mountain Pine Beetles in Canada, delivering the country one of the worst ecological disasters in its history. The insects are not technically invasive, and until recently they existed in a natural balance with their environment; killing off older trees and making room for new growth. But as a new documentary chronicles, climate change eliminated many of the n ...

http://thinkprogress.org/climate/2013/04/11/1855211/climate-change-kee




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