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Beetle-infested Pine Trees Contribute to Air Pollution and Haze in Forests

Scientists Kara Huff Hartz of Southern Illinois University Carbondale, Gannet Hallar of the Desert Research Institute's Storm Peak Laboratory in Steamboat Springs, Colo., and colleagues say that western North America is experiencing a population explosion of mountain pine beetles, a type of bark beetle that damages and kills pines and other trees.

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