Workers tend to a wellhead at a hydraulic fracturing operation outside Rifle, in western Colorado, in March 2013.
Workers tend to a wellhead at a hydraulic fracturing operation outside Rifle, in western Colorado, in March 2013. Brennan Linsley AP
Workers tend to a wellhead at a hydraulic fracturing operation outside Rifle, in western Colorado, in March 2013. Brennan Linsley AP

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