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This May 25, 2014 image provided by the National Guard, shows guardsmen building a sandbag levy against the flood waters of the the swollen North Platte River in Saratoga, Wyo. The river is expected to come close to reaching the record flood stage in Saratoga on Saturday.(AP Photo/National Guard)
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FILE - This May 5, 2014 file photo shows a pickup truck driving down a road of the Homer City Generating Station in Homer City, Pa. The Obama administration is poised to unveil first-ever rules limiting greenhouse gas emissions from the power plants that dot the U.S. map. President Barack Obama says the rules are essential to curb climate change, but critics disagree. (AP Photo/Keith Srakocic, File)
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FILE - This June 25, 2013 file photo shows President Barack Obama wiping perspiration from his face as he speaks about climate change at Georgetown University in Washington. The Obama administration is poised to unveil first-ever rules limiting greenhouse gas emissions from the power plants that dot the U.S. map. President Barack Obama says the rules are essential to curb climate change, but critics disagree. (AP Photo/Charles Dharapak, File)
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ADVANCE FOR USE SUNDAY, JUNE 1, 2014, AND THEREAFTER- FILE - In this April 14, 2014 file photo, commuters wait for an New Jersey Transit train to New York, in Trenton, N.J. Americans took a record 10.7 billion trips on mass transit last year, up 37 percent since 1995, far outpacing population growth. (AP Photo/Mel Evans, File)
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In this May 21, 2014 photo provided by the Wolf Conservation Center, Nikai, a baby wolf, is seen in mid-howl at the Wolf Conservation Center in South Salem, N.Y. Born in April, Nikai will make his debut to the public in early June. (AP Photo/Wolf Conservation Center, Rebecca Bose)
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In this May 21, 2014 photo released by Michigan State University, Jim Wallace and Steven Safferman are shown at a dairy farm where they have helped to convert manure into clean water. A technology for extracting drinkable water from manure is on its way to commercial application this year, Michigan State University said Thursday, May 29, 2014. The McLanahan Nutrient Separation System is an add-on to an anaerobic digester, which extracts energy and chemicals from manure. The system adds ultrafiltration, air stripping and a reverse osmosis system to produce water that’s clean enough for cattle to drink. (AP Photo/Michigan State University, G.L Kohuth)
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FILE - In this Nov. 26, 2013 file photo, Red Cross and UNICEF medics administer polio and measles vaccinations to children at an evacuation center for typhoon survivors more than two weeks after Typhoon Haiyan ravaged the city of Tacloban, Leyte province in central Philippines. Measles cases in the last five months have caused more U.S. illnesses than in any entire year since 1996, according to numbers released by the Center for Disease control and Prevention on Thursday, May 29, 2014. (AP Photo/Bullit Marquez, File)
