| risks to biodiversity from hydraulic fracturing for natural gas in the marcellus and utica shales. | high-volume horizontal hydraulic fracturing (hvhhf) for mining natural gas from the marcellus and utica shales is widespread in pennsylvania and potentially throughout approximately 280,000 km(2) of the appalachian basin. physical and chemical impacts of hvhhf include pollution by toxic synthetic chemicals, salt, and radionuclides, landscape fragmentation by wellpads, pipelines, and roads, alteration of stream and wetland hydrology, and increased truck traffic. despite concerns about human healt ... | 2013 | 23701448 |