Environment
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A helicopter takes off from a staging area of Bureau of Land Management vehicles and other government vehicles off of Riverside Road near Bunkerville, Nev., Saturday, April 5, 2014. (AP Photo/Las Vegas Review-Journal, John Locher)

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A Royal Australian Air Force E-7A Wedgetail takes off from Perth Airport on route to conduct search operations for missing Malaysia Airlines Flight MH370 in southern Indian Ocean, near the coast of Western Australia, Saturday, April 5, 2014. (AP Photo/Rob Griffith)

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FILE - In this Jan. 13, 2010 file photo, two young wild horses play while grazing in Reno, Nev. Wild horse protection advocates say the government is rounding up too many mustangs while allowing livestock to feed at taxpayer expense on the same rangeland scientists say is being overgrazed. (AP Photo/Reno Gazette-Journal, Andy Barron, File) NEVADA APPEAL OUT; NO SALES

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This image taken Friday April 4, 2014 from video shows what Weber State University researchers have created, a multi-sensor array, that goes on the edge of space to help track air pollution. It’s a project that is part of the High Altitude Reconnaissance Balloon for Outreach and Research program, or HARBOR. It will work with the current system, which measures pollution from fixed positions. (AP Photo/Mike Anderson, Deseret News)