Environment

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FILE - In this March 6, 2013 file photo, workers labor at the 'C' Tank Farm at the Hanford Nuclear Reservation, near Richland, Wash. The cleanup of the nation’s largest collection of radioactive waste left over from the production of nuclear weapons was supposed to be nearing an end by now, but 25 years after a landmark agreement was signed to deal with the waste, $30 billion has been spent, and officials are still decades and tens of billions of dollars away from finishing the cleanup of the radioactive mess. (AP Photo/Ted S. Warren, File)

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FILE - In this April 3, 2008 file photo, the sun shines on a radioactive hazard warning sign at a landfill used to bury hazardous materials at the Hanford Nuclear Reservation near Richland, Wash. The cleanup of the nation’s largest collection of radioactive waste left over from the production of nuclear weapons was supposed to be nearing an end by now, but 25 years after a landmark agreement was signed to deal with the waste, $30 billion has been spent, and officials are still decades and tens of billions of dollars away from finishing the cleanup of the radioactive mess. (AP Photo/Ted S. Warren, file)

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FILE - In this July 14, 2010 file photo, workers at the Hanford Nuclear Reservation are shown on the job near a tank farm where highly radioactive waste is stored underground near Richland, Wash. The cleanup of the nation’s largest collection of radioactive waste left over from the production of nuclear weapons was supposed to be nearing an end by now, but 25 years after a landmark agreement was signed to deal with the waste, $30 billion has been spent, and officials are still decades and tens of billions of dollars away from finishing the cleanup of the radioactive mess. (AP Photo/Shannon Dininny, file)

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Opponents of a plan to widen a highway through the historic district of Eufaula, Ala., study satellite images of the area inside Shorter Mansion on Wednesday, May 7, 2014. Supporters of the proposal say it would help ease traffic congestion, but others fear the work would damage the Southern charm of the town, which draws thousands of visitors annually. (AP Photo/Jay Reeves)

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Steve Rodgers stands outside his thrift store as he discusses his support for a plan to widen U.S. 431 through historic Eufaula, Ala., on Wednesday, May 7, 2014. Rodgers and other backers say the project is needed to ease traffic congestion through the city, but opponents fear a loss of shady trees would hurt its Southern charm. (AP Photo/Jay Reeves)

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Cars and trucks drive through the tree-shaded historic district of Eufaula, Ala., on Wednesday, May 7, 2014. The state is considering widening the road, a project opponents fear would destroy the town's Southern charm, but supporters say the move is needed to ease traffic congestion. (AP Photo/Jay Reeves) (AP Photo/Jay Reeves)

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Doug Purcell, former executive director of the Historic Chattahoochee Commission, discusses his opposition to a plan to widen the highway through the historic district in Eufaula, Ala., on Wednesday, May 7, 2014. While backers say the project would relieve traffic congestion caused by tourists, Purcell fears the work would kill trees and damage the Old South charm of the riverside town. (AP Photo/Jay Reeves)

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This May, 1972 photo released by the National Archives, Records of the Environmental Protection Agency, shows a Mexican farm worker in a lettuce field, in Blythe, Ca. The photo is part of "The Way We Worked" , part of the Smithsonian's Museum on Main Street program ? and opens Saturday, May 17, 2014 in Angola, Louisiana, and 270 miles away in Tunica, Mississippi. Identical exhibits also are being shown in Rhode Island, Michigan and California. (AP Photo/Charles O’Rear, National Archives, Records of the Environmental Protection Agency)

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Chuck Burr cultivates a row of onions May 12, 2014 on his organic seed farm outside Ashland, Ore. Organic farmers are asking voters in Jackon and Josephine counties to adopt a ban on cultivating genetically engineered crops, which organic farmers fear could cross-pollinate with some of their crops. (AP Photo/Jeff Barnard)

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Chuck Burr stands with some red chard at his organic seed farm on May 12, 2014 outside Ashland, Ore. Fearful that genetically engineered sugar beets being grown for seed by the Swiss company Syngenta could pollinate their crops of beet and chard seed, organic farmers are asking voters to approve bans on growing genetically engineered crops in Jackson and Josephine counties. (AP Photo/Jeff Barnard)

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Chuck Burr explains his organic seed growing techniques May 12, 2014, on his farm outside Ashland, Ore. Organic farmers are asking voters in Jackon and Josephine counties to adopt a ban on cultivating genetically engineered crops, which organic farmers fear could cross-pollinate with some of their crops. (AP Photo/Jeff Barnard)