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Ice is broken up by the passing of the Finnish icebreaker MSV Nordica as it sails through the Chukchi Sea off the coast of Alaska while traversing the Arctic's Northwest Passage, Sunday, July 16, 2017. The region has become a magnet for nations wanting to exploit the Arctic’s rich oil reserves and other natural resources and for scientists seeking to understand global warming and its impacts on the sea and wildlife. (AP Photo/David Goldman)

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Trainee David Kullualik, of Iqaluit, Nunavut, of Canada's northern territories, looks through binoculars from the bridge of the Finnish icebreaker MSV Nordica as it sails through ice floating on the Chukchi Sea off the coast of Alaska while traversing the Arctic's Northwest Passage, Sunday, July 16, 2017. (AP Photo/David Goldman)

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The Finnish icebreaker MSV Nordica sails through ice floating on the Chukchi Sea off the coast of Alaska, Sunday, July 16, 2017, while traversing the Arctic's Northwest Passage, where global warming is melting sea ice and glaciers at an historic rate, altering and opening up the Arctic as never before. (AP Photo/David Goldman)

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Polar maritime lawyer Scott Joblin, from the Australian National University in Cambria, looks over a map aboard the Finnish icebreaker MSV Nordica as it sets sail in the North Pacific Ocean toward the Bering Strait, Thursday, July 6, 2017. A group of international researchers is sailing into the Arctic Sea aboard the Finnish icebreaker to traverse the Northwest Passage and record the environmental and social changes that are taking place in one of the most forbidding corners of the world. (AP Photo/David Goldman)

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The Tennessee Valley Authority's coal-burning Allen Fossil Plant on Friday, July 14, 2017 in Memphis, Tenn. Groundwater in wells at the plant have tested for excessive levels of arsenic and lead. (AP Photo/Adrian Sainz)

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Dead trees, other debris and mud come to a stop near the First Crossing recreation area during the search and rescue operation for a victim in a flash flood along the banks of the East Verde River Monday, July 17, 2017, in Payson, Ariz. The bodies of several children and adults have been found after Saturday's flash flooding poured over a popular swimming area in the Tonto National Forest. (AP Photo/Ross D. Franklin)

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Members of the Navajo County Search and Rescue Team take a break from searching near the entrance to the First Crossing recreation area during the search and rescue operation for a victim in a flash flood along the banks of the East Verde River Monday, July 17, 2017, in Payson, Ariz. The bodies of several children and adults have been found after Saturday's flash flooding poured over a popular swimming area in the Tonto National Forest. (AP Photo/Ross D. Franklin)

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First responders gather near the entrance to the First Crossing recreation area during the search and rescue operation for a victim in a flash flood along the banks of the East Verde River Monday, July 17, 2017, in Payson, Ariz. The bodies of nearly a dozen children and adults have been found after Saturday's flash flooding poured over a popular swimming area in the Tonto National Forest. (AP Photo/Ross D. Franklin)

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The muddy water was much lower near the Water Wheel recreation area where victims were caught in a flash flood along the banks of the East Verde River Monday, July 17, 2017, in Payson, Ariz. The bodies of nearly a dozen children and adults have been found after Saturday's flash flooding poured over a popular swimming area in the Tonto National Forest. (AP Photo/Ross D. Franklin)

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Smoke rises from trees burned by wildfire on a mountain near Montenegro capital Podgorica, Monday, July 17, 2017. At least 100 tourists have been forced to evacuate from a coastal area in Montenegro that has been the hardest hit by the blaze. Fueled by strong winds and dry weather, the fire on the Lustica peninsula in southern Montenegro has spread near to homes and camping zones. (AP Photo/Risto Bozovic)

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A smoke rises over Montenegro capital Podgorica, Montenegro, Monday, July 17, 2017. At least 100 tourists have been forced to evacuate from a coastal area in Montenegro that has been the hardest hit by the blaze. Fueled by strong winds and dry weather, the fire on the Lustica peninsula in southern Montenegro has spread near to homes and camping zones. (AP Photo/Risto Bozovic)

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Smoke rises from trees burned by wildfire on a mountain near Montenegro capital Podgorica, Monday, July 17, 2017. At least 100 tourists have been forced to evacuate from a coastal area in Montenegro that has been the hardest hit by the blaze. Fueled by strong winds and dry weather, the fire on the Lustica peninsula in southern Montenegro has spread near to homes and camping zones. (AP Photo/Risto Bozovic)

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FILE - This April 18, 2008 file photo provided by the U.S. Fish and Wildlife shows a grey wolf. A federal report says gray wolves killed a record number of livestock in Wyoming in 2016, and wildlife managers responded by killing a record number of wolves that were responsible. The report released by the U.S. Fish and Wildlife Service found that wolves killed 243 livestock, including one horse, in 2016 in Wyoming. As a result, wildlife managers last year killed 113 wolves that were confirmed to be attacking livestock. (AP Photo/U.S. Fish and Wildlife Service, Gary Kramer, File)

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FILE-In this Friday, July 14, 2017 aerial file photo, debris is strewn about after a sinkhole damaged two homes in Land O' Lakes, Fla. Heavy equipment will be brought in Wednesday, July 19, 2017 to the neighborhood in Pasco County, north of Tampa, to clean up debris left over from the damage caused by the sinkhole. (Luis Santana/Tampa Bay Times via AP, File)

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This March 18, 2017 photo shows an area of Ellison Creek, a popular area in Tonto National Forest near Payson, Ariz. On Saturday, July 15, 2017, a flash flood through the area swept nearly a dozen people to their deaths. The flood was the result of a thunderstorm that dumped heavy rainfall just upstream, unleashing 6-foot-high floodwaters, dark with ash from a summer wildfire. (AP Photo/Clarice Silber)

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Members of the Tonto Rim Search and Rescue Team comb the muddy East Verde River near the entrance to the First Crossing recreation area during the search and rescue operation for a victim in a flash flood Monday, July 17, 2017, in Payson, Ariz. The bodies of several children and adults have been found after Saturday's flash flooding poured over a popular swimming area in the Tonto National Forest. (AP Photo/Ross D. Franklin)

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Members of the Coconino County Search and Rescue Team take a break near the entrance to the First Crossing recreation area during the search and rescue operation for a victim in a flash flood along the banks of the East Verde River Monday, July 17, 2017, in Payson, Ariz. The bodies of several children and adults have been found after Saturday's flash flooding poured over a popular swimming area in the Tonto National Forest. (AP Photo/Ross D. Franklin)

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A Navajo County rescuer uses her walking stick to sift through debris in Tonto National Forest, Ariz., on Monday, July 17, 2017. Rescuers continue the search for a missing 27-year-old man, who was swept downriver with more than a dozen others when floodwaters inundated the area on Saturday. (Ap Photo/Angie Wang)

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Volunteer rescuers from Navajo County begin searching for a missing 27-year-old man in Tonto National Forest, Ariz., Monday, July 17, 2017. The man was swept downriver with more than a dozen others when floodwaters inundated the area on Saturday. (AP Photo/Angie Wang)

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A Navajo County rescuer searches the riverbank under the bridge where one body was recovered in Tonto National Forest, Ariz., Monday, July 17, 2017. Rescuers continue the search for a missing 27-year-old man, who was swept downriver with more than a dozen others when floodwaters inundated the area on Saturday. (AP Photo/Angie Wang)