Environment
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FILE - In this Feb. 10, 2006 file photo released by Michigan Technological University, a pack of gray wolves is shown on Isle Royale National Park in northern Michigan. Scientists on Wednesday, April 30, 2014 say the slumping wolf population at Isle Royale National Park is leading to a boom in the number of moose on the Lake Superior island chain. The development reflects what researchers say are dim prospects for the wolves' long-term survival and raises the possibility that a runaway moose population will damage the island's vegetation. (AP Photo/Michigan Technological University, John Vucetich)

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FILE - In this Friday, Feb. 14, 2014, file photo, morning traffic makes it's way toward downtown Los Angeles along the Hollywood Freeway past an electronic sign warning of severe drought. As of Wednesday, April 30, 2014, Pensacola, Florida, got more rain in one stormy day than drought-struck Los Angeles has had in more than two years. (AP Photo/Richard Vogel, File)

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Two cars are covered in sediment as floodwaters recede along Strong Street in Pensacola, Fla., Wednesday, April 30, 2014. ensacola, Florida, got more rain on Wednesday than drought-struck Los Angeles has had in more than two years. (AP Photo/G.M. Andrews)

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Residents walk near a truck stuck in deep water and mud on Piedmont Street after flood-water damage caused by torrential rains in Pensacola, Fla., Wednesday, April 30, 2014. (AP Photo/G.M. Andrews)