Environment

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FILE - In this Dec. 24, 2009 file photo, the tug Pathfinder is surrounded by a spill containment boom, in Prince William Sound, Alaska. It is the left of the two boats at the bottom right of photo. The Pathfinder, a 136-foot tug scouting for ice along Prince William Sound's oil shipping lanes near Valdez, Alaska, grounded on Bligh Reef. Something is holding down the herring population of Alaska's Prince William Sound. Marine scientists are tailing a possible suspect: humpback whales. Humpbacks are thriving in the waters fouled 21 years ago by the Exxon Valdez oil spill. At the time, the herring population crashed, but should have rebounded by now. Nearly 25 years after the Exxon Valdez oil spill off the coast of Alaska, some damage heals, some effects linger in Prince William Sound. (AP Photo/Anchorage Daily News, Marc Lester, File) FRONTIERSMAN OUT

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FILE - In this Sept. 14, 1998 file photo, Bruce Wright, a biologist with the National Marine Fisheries Service Oil Spill Restoration Office, looks at a pink salmon as it swims up a stream at Sleepy Bay on LaTouche Island in Prince Williams Sound, Alaska. State officials say pink salmon have not yet recovered from the effects of the Exxon Valdez oil spill 10 years ago. Nearly 25 years after the Exxon Valdez oil spill off the coast of Alaska, some damage heals, some effects linger in Prince William Sound. (AP Photo/Al Grillo, File)

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Emily Boyd, 8, of Columbia, S.C. walks along the fence near the Washington Monument which is set to reopen in May, Washington, D.C., Thursday, March 20, 2014. The monument has been closed since 2011 for earthquake damage repairs. (Andrew Harnik/The Washington Times)

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The Lund family from Wisconsin poses together in front of the Washington Monument, which is set to reopen in May, Washington, D.C., Thursday, March 20, 2014. The monument has been closed since 2011 for earthquake damage repairs. (Andrew Harnik/The Washington Times)

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FILE - This March 3, 2014 file photo provided by the North Dakota Health Department is an abandoned building in Noonan, ND, where officials reported the illegal dumping of hundreds of radioactive oil filter socks, the tubular nets that strain liquids during the oil production process. North Dakota will pay for the cleanup of radioactive waste, according to documents obtained Thursday, March, 20, 2014 by The Associated Press shows. (AP Photo/North Dakota Health Department, File)

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FILE - This Oct. 10, 2013 file aerial photo shows dead cattle in an area hard hit by a snowstorm that killed thousands of animals near Faith, S.D. The North Dakota Stockmen's Foundation has awarded nearly $200,000 to North Dakota and South Dakota ranchers who lost livestock in the blizzard. The foundation issued the last of its aid checks to ranchers this week with about $163,000 going to producers in North Dakota. (AP Photo/KOTA-TV, Pool, File)

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Gladys Mwende, Benson Muthame and their son cultivate one acre in Nairobi, despite lacking title to the land. (Credit: Olu Akintorln)

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In this undated photo, the Soda Lake in the Mojave National Preserve reflects the sky in San Bernardio County, Calif. A commercial solar project is proposed within a mile of the lake bed, prompting worries about water depletion and the fate of an endangered fish, among other concerns. (AP Photo/The Press-Enterprise, David Danelski) MAGS OUT; MANDATORY CREDIT

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In this February 2014 aerial photo, the white-colored Soda Lake is visible in the Mojave National Preserve in San Bernardio County, Calif. A commercial solar project is proposed within a mile of the lake bed, prompting worries about water depletion and the fate of an endangered fish, among other concerns. (AP Photo/The Press-Enterprise, Kurt Miller) MAGS OUT; MANDATORY CREDIT

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In this undated photo, a female and immature bighorn walk in the Mojave National Preserve in San Bernardio County, Calif. The National Park Service says a proposed 6.5-square-mile solar development about a half-mile from the Mojave National Preserve would harm wildlife. (AP Photo/The Press-Enterprise, Mark Zaleski) MAGS OUT; MANDATORY CREDIT

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In this undated photo, a desert tortoise crawls in the Mojave National Preserve in San Bernardio County, Calif. The National Park Service says a proposed 6.5-square-mile solar development about a half-mile from the Mojave National Preserve would harm wildlife. (AP Photo/The Press-Enterprise, Stan Lim) MAGS OUT; MANDATORY CREDIT

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In this undated photo, burrowing owls looks on in Wildomar, Calif. The National Park Service says a proposed 6.5-square-mile solar development about a half-mile from the Mojave National Preserve would harm wildlife, such as the borrowing owl. (AP Photo/The Press-Enterprise, Stan Lim) MAGS OUT; MANDATORY CREDIT