Environment

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Wake Forest's Coron Williams, center, drives between Duke's Marshall Plumlee, left, and Amile Jefferson during the first half of an NCAA college basketball game in Winston-Salem, N.C., Wednesday, March 5, 2014. (AP Photo/Chuck Burton)

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This image released by Warner Bros. Pictures shows Eva Green in "300: Rise of an Empire." (AP Photo/Warner Bros. Pictures)

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This image released by Warner Bros. Pictures shows Eva Green in "300: Rise of an Empire." (AP Photo/Warner Bros. Pictures)

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In this Feb. 16, 2014 satellite image provided by the NOAA Great Lakes CoastWatch is the ice cover on Lake Superior. The Army Corps of Engineers said Wednesday, March 5, 2014 that the heavy ice cover and snowfall across the Great Lakes basin should help water levels move closer to normal over the next six months. (AP Photo/NOAA Great Lakes CoastWatch)

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FILE - This June 8, 2005 file photo shows Terry McAllister, of Bigfork, Mont., checking out the Kerr Dam, near Polson, Mont. The Salish and Kootenai Tribes would have to pay nearly $18.3 million to acquire the northwestern Montana hydroelectric dam from PPL Montana, an arbitration panel has determined. Energy Keepers Inc., a tribally-owned corporation, said Wednesday, March 5, 2014 the tribes will notify the Federal Energy Regulatory Commission of their intent to acquire the Kerr Project on the Flathead River southwest of Polson in September 2015. (AP Photo/Daily Inter Lake, Chris Jordan, File)

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This Wednesday, March, 5, 2014 photo shows debris and damage from the previous day's explosion at a townhouse complex in Ewing, N.J. Investigators are looking to determine what triggered a natural gas leak and explosion that devastated the development, killing one woman and injuring seven workers. (AP Photo/Mel Evans)

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This Wednesday, March, 5, 2014 photo shows debris and damage from the previous day's explosion at a townhouse complex in Ewing, N.J. Investigators are looking to determine what triggered a natural gas leak and explosion that devastated the development, killing one woman and injuring seven workers. (AP Photo/Mel Evans)

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Firefighters move a hose near the debris of the previous day's explosion at a townhouse complex in Ewing, N.J. on Wednesday, March, 5, 2014. Investigators are looking to determine what triggered a natural gas leak and explosion that devastated the development, killing one woman and injuring seven workers. (AP Photo/Mel Evans)

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This Wednesday, March, 5, 2014 photo shows debris and damage from the previous day's explosion at a townhouse complex in Ewing, N.J. Investigators are looking to determine what triggered a natural gas leak and explosion that devastated the development, killing one woman and injuring seven workers. (AP Photo/Mel Evans)