Energy Companies Drill for Oil in the Niobrara Formation in Northeastern Colorado
Many residents have protested the hydraulic fracturing oil drilling citing contamination of the ground and air 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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