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In this March 29, 2013, photo, a worker uses hand signals to communicate with a co-worker over the sound of massive pumps at an Encana Oil & Gas (USA) Inc. hydraulic fracturing and extraction site, outside Rifle, in western Colorado. Millions of gallons of water are pumped down well holes to split open oil- and gas-bearing formations in the hydraulic fracturing process. Much of the water used at this site was being recycled to save money and avoid wasting precious local water supplies. (AP Photo/Brennan Linsley)

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