Invasive, non-native plant species are “rapidly invading” northern forests in Pennsylvania because of fracking in the Marcellus shale basin, a group of Penn State researchers say. http://lancasteronline.com/sports/outdoors/fracking-is-causing-invasion-of-harmful-non-native-plants-in/article_81308b20-77ba-11e7-b759-3bde084426ab.html