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$SOUTH MONTROSE, PA - JUNE 19: Equipment used for the extraction of natural gas is viewed at a hydraulic fracturing site on June 19, 2012 in South Montrose, Pennsylvania. Hydraulic fracturing, also known as fracking, stimulates gas production by injecting wells with high volumes of chemical-laced water in order to free-up pockets of natural gas below. The process is controversial with critics saying it could poison water supplies, while the natural-gas industry says it's been used safely for decades. (Photo by Spencer Platt/Getty Images)$

SOUTH MONTROSE, PA - JUNE 19: Equipment used for the extraction of natural gas is viewed at a hydraulic fracturing site on June 19, 2012 in South Montrose, Pennsylvania. Hydraulic fracturing, also known as fracking, stimulates gas production by injecting wells with high volumes of chemical-laced water in order to free-up pockets of natural gas below. The process is controversial with critics saying it could poison water supplies, while the natural-gas industry says it's been used safely for decades. (Photo by Spencer Platt/Getty Images)