Environment
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This March 18, 2014 image provided by the U.S. Fish & Wildlife Service shows a pair of endangered nener, Hawaiian geese, ] with their newly-hatched goslings at the James Campbell National Wildlife Refuge near Kahuku on the island of Oahu in Hawaii. A federal biologist said Wednesday, March 26, 2014, these nene, the state bird of Hawaii. They are the first nene to make a home on Oahu since at least the 1700s. (AP Photo/US Fish & Wildlife Service)

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Remote Alaskan villages, including King Cove, rely on air travel for access to major hospitals. (Associated Press/File)

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A searcher stands on a huge pile of debris, including the remains of homes and other structures, at the scene of a deadly mudslide, Wednesday, March 26, 2014, in Oso, Wash. The debris field is about a square mile and 30 to 40 feet deep in places, with a moon-like surface that includes quicksand-like muck, rain-slickened mud and ice. The terrain is difficult to navigate on foot and makes it treacherous or impossible to bring in heavy equipment. (AP Photo/Rick Wilking, Pool)

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Searchers walk carefully among debris at the scene of a deadly mudslide, Wednesday, March 26, 2014, in Oso, Wash. The debris field is about a square mile and 30 to 40 feet deep in places, with a moon-like surface that includes quicksand-like muck, rain-slickened mud and ice. The terrain is difficult to navigate on foot and makes it treacherous or impossible to bring in heavy equipment. (AP Photo/Rick Wilking, Pool)

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A barge anchored over winter, waits for the ice to melt on the Mississippi River near Winona, Minn., on Tuesday, March 25, 2014. The shipping season has been delayed because of thicker than normal ice. (AP Photo / Rochester Post-Bulletin, Joe Michaud-Scorza)

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Patches of open water on the Mississippi River near Winona, Minn. can be seenon Wednesday, March 26, 2014, the shipping season has been delayed because of thicker than normal ice. The locks and dams are ready for that first tow but nothing's going to happen until the cold relaxes and the ice melts. (AP Photo/ Rochester Post-Bulletin, Joe Michaud-Scorza)

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A Great Blue Heron flys over open water on the Mississippi River near Winona, Minn., on Wednesday, March 26, 2014. The shipping season has been delayed because of thicker than normal ice on the river. (AP Rochester Post-Bulletin, Joe Michaud-Scorza)