Environment

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Debris is cleared from downtown Sutton, Neb., Monday, May 12, 2014, after a tornado touched down in town on Sunday. Several tornadoes moved across Nebraska on Sunday causing damage to homes and businesses in or near Sutton, Garland, Cordova and Daykin. The storms also left more than 18,000 utility customers without electricity. (AP Photo/Nati Harnik)

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Smashed cars and belongings litter the surroundings of a house in Cordova, Neb., Monday, May 12, 2014, after several tornadoes moved across Nebraska on Sunday causing damage to homes and businesses in or near Sutton, Garland, Cordova and Daykin. The storms also left more than 18,000 utility customers without electricity. (AP Photo/Nati Harnik)

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FILE - In this Aug. 19, 2011 file photo, North Dakota Agriculture Commissioner Doug Goehring listens during a meeting of farm interest groups at the state Capitol in Bismarck. The state Agriculture Department has scheduled this year's round of Project Safe Send chemical collections around North Dakota. The program gives farmers, ranchers, pesticide dealers and applicators, government agencies and homeowners a way to dispose of unusable herbicides, insecticides, rodenticides and fungicides free of charge. (AP Photo/Dale Wetzel, File)

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Injured Finland forward Pekka Jormakka is taken away from the ice during the Group B preliminary round match between Russia and Finland at the Ice Hockey World Championship in Minsk, Belarus, Sunday, May 11, 2014. (AP Photo/Darko Bandic)

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Injured Finland forward Pekka Jormakka is taken away from the ice during the Group B preliminary round match between Russia and Finland at the Ice Hockey World Championship in Minsk, Belarus, Sunday, May 11, 2014. (AP Photo/Darko Bandic)

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Vicki Dixon, an Interior Department employee, right, helps her colleague Steven Avila, with his Washington Monument costume at the Washington Monument in Washington, Monday, May 12, 2014, ahead of a ceremony to celebrate its re-opening. The monument, which sustained damage from an earthquake in August 2011, is reopening to the public today. Avila made the costume to show his support for the re-opening of the monument. (AP Photo)

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Steven Avila, an Interior Department employee, carries a Washington Monument costume as he arrives at the Washington Monument in Washington, Monday, May 12, 2014, ahead of a ceremony to celebrate its re-opening. The monument, which sustained damage from an earthquake in August 2011, is reopening to the public today. Avila made the costume to show his support for the re-opening of the monument. (AP Photo)

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FILE - In this June 13, 2007 file photo, South Dakota Tourism and State Development Secretary Richard Benda speaks at a news conference in Elk Point, S.D. Benda was found dead in October 2013 in a grove of trees near Lake Andes with a fatal shotgun wound. His death was ruled a suicide. Attorney General Marty Jackley says the Office of Hearing Examiners has upheld his withholding of the public release of investigative records into the death of Benda. (AP Photo/File)