In this March 29, 2013 photo, a rig drills for natural gas which will eventually be released using hydraulic fracturing, or fracking, on leased private property outside Rifle, in western Colorado. Once drilling is completed, wells are fractured to allow the flow of gas from deposits typically more than a mile underground. (AP Photo/Brennan Linsley)

Associated Press
In this March 29, 2013 photo, a rig drills for natural gas which will eventually be released using hydraulic fracturing, or fracking, on leased private property outside Rifle, in western Colorado. Once drilling is completed, wells are fractured to allow the flow of gas from deposits typically more than a mile underground. (AP Photo/Brennan Linsley)
In this March 29, 2013 photo, a rig drills for natural gas which will eventually be released using hydraulic fracturing, or fracking, on leased private property outside Rifle, in western Colorado. Once drilling is completed, wells are fractured to allow the flow of gas from deposits typically more than a mile underground. (AP Photo/Brennan Linsley)
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