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This photo taken on Thursday, Jan. 19, 2012, near Frederick, Colo., shows an oil pump jack working on a property across from a subdivision. Colorado this week passed what it touted as one of the toughest statewide regulations of energy drilling in the nation, a sign of a growing backlash against an oil and gas boom that has moved from far-flung rural areas to densely-populated urban ones. The state's new regulations require a 500-foot setback from houses for all new energy projects and other regulations geared toward areas like the Denver suburbs that are increasingly being targeted for natural gas and oil drilling.(AP Photo/Ed Andrieski)