Impact of Marcellus Shale Gas Development on Rivers, Streams and Forests: a public forum on the Effects of Gas Extraction on Recreation, Hunting, Fishing, Hiking, etc.. Nov. 1, 2010, Lansing, NY. Marcellus gas development in Pennsylvania is making a difference for people who use the outdoors for recreation, including hiking, fishing, biking, birding, hunting, camping, and other outdoor activities. Pennsylvanians and those who have studied wilderness impact in PA over the past 3 years will share what they have learned, and answer questions from the audience at this free, educational forum. High volume, slick water, hydraulic fracturing (often called hydro-fracking) requires withdrawing millions of gallons of water from nearby rivers, lakes, and streams, mixing it with chemicals, and injecting the solution under high pressure into the shale to release the gas.