Fracking Pennsylvania (16 images)

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Fracking Pennsylvania

There is a war brewing in the hills of central Pennsylvania and the southern tier of New York. Half a mile underground, in the shale bedrock, are vast natural gas deposits worth an estimated one trillion dollars. An increasingly common drilling method called hydraulic fracturing or "fracking" makes it feasible to extract the gas by pumping millions of gallons of water, sand and proprietary chemicals down wells under high pressure.

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