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Historic Pa. forest faces invasive insect threat

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PITTSBURGH (AP) — A historic state forest filled with towering hemlocks is facing a serious threat from invasive insects, and scientists say climate change appears to be a contributing factor. Cook Forest State Park, a National Natural Landmark, is known for its majestic, old-growth trees, some of which are over 140 feet tall. They help to create a cool, shaded environment for numerous...

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