Associated Press: Invasive insects have been found in a third landmark Pennsylvania forest, and scientists are considering a possible link to global warming. The U.S. Forest Service reported this week that the hemlock wooly adelgid has been discovered in the Tionesta forest near the New York border. Experts said the insect is often deadly to hemlocks, and the loss of those trees can lead to a cascade of environmental changes for some wildlife, fish, and plants that need the cool, deep shade that the old growth trees…

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