Fracking site in Pennsylvania

A Cabot Oil and Gas natural gas drill is viewed at a hydraulic fracturing site on January 17, 2012 in Springville, Pennsylvania. A new study based in Colorado says air pollution at drilling sites using the ¿fracking¿ method contributes to health problems.

( Spencer Platt/Getty Images )

A Cabot Oil and Gas natural gas drill is viewed at a hydraulic fracturing site on January 17, 2012 in Springville, Pennsylvania. A new study based in Colorado says air pollution at drilling sites using the ┬┐fracking┬┐ method contributes to health problems.

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