High-volume hydraulic fracturing allows exploitation of unconventional gas reserves in the Marcellus Shale underlying the Appalachian Basin Province. The greatest production potential lies in northeastern Pennsylvania, and here is where problems surfaced. Reports of explosions, fracked fluid spills, and groundwater contamination underscore technology risks. It's unlikely that drilling will cease, considering the formation is estimated to contain more than 500 tcf of gas. How can this resource be extracted in an economically and environmentally sound manner?
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