Environment

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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 that 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)

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Capitals goaltender Braden Holtby made 33 saves Tuesday against the Hurricanes, including one on a short-handed breakaway by Alexander Semin. (Associated Press)

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Archbishop Pier Luigi Celata reads a copy of a document signed by Pope Benedict XVI changing the rules of the conclave. (Associated Press)

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Archbishop Pier Luigi Celata reads a copy of a document signed by Pope Benedict XVI changing the rules of the conclave. (Associated Press)

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** FILE ** In this aerial file photo created on Wednesday, April 21, 2010, in the Gulf of Mexico, more than 50 miles southeast of Venice on Louisiana's tip, an oil slick is seen as the Deepwater Horizon oil rig burns. Nearly three years after the deadly rig explosion in the Gulf of Mexico triggered the nation's worst offshore oil spill, a federal judge in New Orleans is set to preside over a high-stakes trial for the raft of litigation spawned by the disaster on Monday Feb. 25, 2013. (AP Photo/Gerald Herbert, file)

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Workers at the Hanford Nuclear Reservation near Richland, Wash., are on duty at an underground tank farm where highly radioactive waste is stored on July 14, 2010. (AP Photo/Shannon Dininny)

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Curt Viebranz, the president of George Washington’s historic Mount Vernon estate, stands outside what will be a climate-controlled book vault inside the under-construction George Washington Library at Mount Vernon, Va., on Wednesday, Feb. 13, 2013. (AP Photo/Jacquelyn Martin)