7. Mountain Pine Beetle
Having seen the devastation that this tiny creature has wrought in Rocky Mountain National Park, I really hate this one. The Mountain Pine Beetles are working their way across parts of the United States, destroying thousands of acres of trees. Even worse, climate change is helping them, since they move faster in warmer climes. There is really no way to stop this onslaught. Mountain Pine Beetles have impacted more than 4 million acres since the first signs of outbreak in 1996.
Photo Credit: nrdc_media
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