Environment

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William J. Bosanko, NARA's Executive for Agency Services, said officials are searching for missing boxes. (Associated Press)

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Rail cars transport coal to energy providers across the U.S. Environmentalists are trying to keep the fossil fuel inside the nation's borders and take responsibility for carbon emissions. (Associated Press)

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Barges filled with coal and wells pumping natural gas give the U.S. enough fuel to export to burgeoning markets in Asia, but proposals to build a natural gas liquefaction and export plant in Maryland and coal export facilities in the Pacific Northwest have raised environmental concerns about the global use of fossil fuels. (Associated Press)

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Boats tack for position before the start of the Newport Ocean Sailing Association's Newport-to-Ensenada yacht race on Friday, April 27, 2012, in Corona Del Mar, Calif. (AP Photo/The Orange County Register, Ken Steinhardt)

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This Thursday, April 26, 2012, photo provided by the CU Independent shows a bear that wandered into the University of Colorado Boulder, Colo., dorm complex Williams Village falling from a tree after being tranquilized by Colorado wildlife officials. (AP Photo/CU Independent, Andy Duann)

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Turkish Energy Minister Taner Yildiz (left) joins Turkish Cypriot leader Dervis Eroglu (second from right) on a drilling platform Thursday to mark the start of exploratory oil and gas drilling by Turkey in the northern half of ethnically split Cyprus. (Associated Press)

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North Korean soldiers stand guard at the Demilitarized Zone that separates the two halves of the Korean Peninsula at Panmunjom, North Korea. The building in the background stands in the South. (Associated Press)

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A plate of pancakes with blueberries and granola mixed in the batter is displayed in Concord, N.H. (AP Photo/Matthew Mead)

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Robert Ward displays on April 25, 2012, one of two pieces of a meteorite he found at a park in Lotus, Calif. The meteor was probably about the size of a minivan when it entered the Earth's atmosphere three days earlier with a loud boom at about 8 a.m. (Associated Press)

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** FILE ** Ulysses Dublin, one of four full-time Massport wildlife technicians, fires a nonlethal pyrotechnic round from a standard shotgun to disperse birds from the runways and surrounding areas at Boston's Logan International Airport in January 2009. (AP Photo/Pool, John Tlumacki)