Great question. I dont think the precise number of trees killed by the bark beetle is known, but researchers and foresters have estimated the number of acres impacted by bark beetle infestation. As of 2010, about 7 million acres of conifer forests have been impacted in the U.S. and it is estimated that over the next 15 years, an additonal 22 million acres of conifer forests will be impacted, primarily in the west. In Canada, an additional 34 million acres of forest have been impacted by the beetles. Clearly these beetles (there are multiple species of them) are creating a sort of ecological crisis in western forests.
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