“Cabot’s Methodology Links Tainted Water Wells to Gas Fracking”

Methane in two Pennsylvania water wells has a chemical fingerprint that links it to natural gas produced by hydraulic fracturing, evidence that such drilling can pollute drinking water. The data, collected by the U.S. Environmental Protection Agency, are significant because the composition of the gas –its isotopic signature — falls into a range Cabot Oil & Gas Corp. had identified as that of the Marcellus Shale, which it tapped through hydraulic fracturing, or fracking.

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