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In this March 25, 2014 photo, a worker adjusts pipes during a hydraulic fracturing operation at an Encana Corp. well pad near Mead, Colo. The first experimental use of hydraulic fracturing was in 1947, and more than 1 million U.S. oil and gas wells have been fracked since, according to the American Petroleum Institute. The National Petroleum Council estimates that up to 80 percent of natural gas wells drilled in the next decade will require hydraulic fracturing. (AP Photo/Brennan Linsley)
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In this March 25, 2014 photo, a worker oils a pump during a hydraulic fracturing operation at an Encana Corp. well pad near Mead, Colo. The first experimental use of hydraulic fracturing was in 1947, and more than 1 million U.S. oil and gas wells have been fracked since, according to the American Petroleum Institute. The National Petroleum Council estimates that up to 80 percent of natural gas wells drilled in the next decade will require hydraulic fracturing. (AP Photo/Brennan Linsley)
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In this March 25, 2014 photo, a worker wears a protective helmet decorated with stickers during a hydraulic fracturing operation at a gas well, near Mead, Colo. The first experimental use of hydraulic fracturing was in 1947, and more than 1 million U.S. oil and gas wells have been fracked since, according to the American Petroleum Institute. The National Petroleum Council estimates that up to 80 percent of natural gas wells drilled in the next decade will require hydraulic fracturing. (AP Photo/Brennan Linsley)
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In this March 25, 2014 photo, a worker watches over a hydraulic fracturing operation at an Encana Corp. gas well near Mead, Colo. In the background is a tall canvas wall around the perimeter of the extraction site, which mitigates noise, light and dust coming from the operation during the drilling and completion phase, which generally takes a few weeks. (AP Photo/Brennan Linsley)
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In this March 25, 2014 photo, a worker adjusts hoses during a hydraulic fracturing operation at an Encana Corp. gas well, near Mead, Colo. The first experimental use of hydraulic fracturing was in 1947, and more than 1 million U.S. oil and gas wells have been fracked since, according to the American Petroleum Institute. The National Petroleum Council estimates that up to 80 percent of natural gas wells drilled in the next decade will require hydraulic fracturing. (AP Photo/Brennan Linsley)
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In this March 25, 2014 photo, a worker watches over a hydraulic fracturing operation at an Encana Corp. gas well, near Mead, Colo. In the background is a tall canvas wall around the perimeter of the extraction site, which mitigates noise, light and dust coming from the operation during the drilling and completion phase, which generally takes a few weeks. (AP Photo/Brennan Linsley)
