Pennsylvania vs. climate change

Pittsburgh Post Gazette: Slowly but surely, Lyme disease has reached near epidemic proportions in Pennsylvania. Twenty years ago, most of us never heard of Lyme disease. Now, most of us know someone who has had it and many of us have had it as well. Ticks not only are more abundant in Pennsylvania, but they also have migrated into Canada. It's no coincidence that warmer winters have facilitated the spread of ticks to the North. Another noxious insect pest, the wooly adelgid, is decimating our state tree, the hemlock.......

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