Energy Companies Drill for Oil in the Niobrara Formation in Northeastern Colorado
A loaded water truck leaves the water depot behind with its natural gas flame run off behind him at the Niobrara oil shale formation in Weld County, North eastern Colorado on May 30, 2012. Gas and oil companies are using large amounts of water to obtain shale oil and gas in a process called hydraulic fracturing or fracking. UPI/Gary C. Caskey
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