In this July 22, 2010 photo, poison ivy is seen ...

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Marty Heisey | published: December 5, 2010

In this July 22, 2010 photo, poison ivy is seen at Lancaster County Park, in Lancaster, Pa. Dr. Alan Peterson, of Walter L. Aument Family Health Center in Quarryville, said this season is the worst he's seen for poison ivy cases. He believes the increase is the result of an increase of carbon dioxide in the atmosphere.



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