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In this Friday, July 14, 2017 photo released by the Vermont Fish & Wildlife Department, state botanist Everett Marshall documents the extent of winged loosestrife at Raven Ridge Natural Area in Monkton, Vt., for the state's Natural Heritage Inventory. Winged loosestrife is making a comeback in Vermont where it had not been seen for decades and was thought to be locally extinct. (Tom Rogers/Vermont Fish & Wildlife Department via AP)

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FILE - In this Sept. 10, 2016, file photo, Wake Forest quarterback Kendall Hinton (2) passes against Duke during the second half of an NCAA college football game in Durham, N.C. Now that he’s healthy again, Kendall Hinton might not take as many unnecessary chances in his latest stint as Wake Forest’s starting quarterback. He’s back to 100 percent after a knee injury kept him out of the final 10 games of last season. (AP Photo/Gerry Broome, File)

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The sun sets over melting sea ice on Peel Sound along the Northwest Passage in the Canadian Arctic Archipelago, Sunday, July 23, 2017. Because of global warming, more sea ice is being lost each summer than is being replenished in winters. Although sea ice is likely to continue forming each winter it may be restricted to even higher latitudes. Less sea ice coverage also means that less sunlight will be reflected off the surface of the ocean in a process known as the albedo effect. The oceans will absorb more heat, further fueling global warming. (AP Photo/David Goldman)

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Second officer Juha Tuomi looks out from Finnish icebreaker MSV Nordica as it sails into floating sea ice on the Victoria Strait while traversing the Northwest Passage in the Canadian Arctic Archipelago, Friday, July 21, 2017. Sea ice plays an important role in the global climate system by cooling the surrounding water and air. (AP Photo/David Goldman)

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A bird flies above sea ice on the Victoria Strait along the Northwest Passage in the Canadian Arctic Archipelago, Friday, July 21, 2017. Sea ice forms when the top layer of water reaches freezing point, usually around the start of October. As temperatures continue to fall this first-year ice grows downward until it is several feet thick. If the ice survives the following summer melt it becomes second-year ice. Another cycle and it becomes multi-year ice _ which is the toughest kind. (AP Photo/David Goldman)

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Sea ice cracks as the Finnish icebreaker MSV Nordica passes through the Victoria Strait along the Northwest Passage in the Canadian Arctic Archipelago, Friday, July 21, 2017. Sea ice helps maintain ocean and atmospheric currents that affect weather which is characteristic for certain parts of the world, such as the comparatively mild temperatures found in western Europe. (AP Photo/David Goldman)

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Researchers look out from the Finnish icebreaker MSV Nordica as the sun sets over sea ice floating on the Victoria Strait along the Northwest Passage in the Canadian Arctic Archipelago, Friday, July 21, 2017. Sea ice plays an important role in the global climate system by cooling the surrounding water and air. It helps maintain ocean and atmospheric currents that affect weather which is characteristic for certain parts of the world, such as the comparatively mild temperatures found in western Europe. (AP Photo/David Goldman) **FILE**

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new_arctic_the_journey_melting_ice_42549.jpg

The sun sets over sea ice floating on the Victoria Strait along the Northwest Passage in the Canadian Arctic Archipelago, Friday, July 21, 2017. Sea ice forms when the top layer of water reaches freezing point, usually around the start of October. As temperatures continue to fall this first-year ice grows downward until it is several feet thick. If the ice survives the following summer melt it becomes second-year ice. Another cycle and it becomes multi-year ice _ which is the toughest kind. (AP Photo/David Goldman)

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new_arctic_the_journey_melting_ice_12272.jpg

The Finnish icebreaker MSV Nordica sails through sea ice floating on the Beaufort Sea off the coast of Alaska while traversing the Arctic's Northwest Passage, Sunday, July 16, 2017. Because of global warming, more sea ice is being lost each summer than is being replenished in winters. Less sea ice coverage also means that less sunlight will be reflected off the surface of the ocean in a process known as the albedo effect. The oceans will absorb more heat, further fueling global warming. (AP Photo/David Goldman)

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Chief engineer Jukka-Pekka Silander watches from the bow of the the Finnish icebreaker MSV Nordica as it sails into floating sea ice on the Beaufort Sea off the coast of Alaska while traversing the Arctic's Northwest Passage, Sunday, July 16, 2017. Sea ice plays an important role in the global climate system by cooling the surrounding water and air. It helps maintain ocean and atmospheric currents that affect weather which is characteristic for certain parts of the world, such as the comparatively mild temperatures found in western Europe. (AP Photo/David Goldman)

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Sea ice melts on the Franklin Strait along the Northwest Passage in the Canadian Arctic Archipelago, Saturday, July 22, 2017. Because of climate change, more sea ice is being lost each summer than is being replenished in winters. Less sea ice coverage also means that less sunlight will be reflected off the surface of the ocean in a process known as the albedo effect. The oceans will absorb more heat, further fueling global warming. (AP Photo/David Goldman)

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A view of the Tiber River, whose level is low due to the drought, during a warm and sunny day in Rome, Wednesday, July 26, 2017. Scarce rain and chronically leaky aqueducts have combined this summer to hurt farmers in much of Italy and put Romans at risk for drastic water rationing as soon as this week. (AP Photo/Domenico Stinellis)

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A view of the Tiber River, whose level is low due to the drought, during a warm and sunny day in Rome, Wednesday, July 26, 2017. Scarce rain and chronically leaky aqueducts have combined this summer to hurt farmers in much of Italy and put Romans at risk for drastic water rationing as soon as this week. (AP Photo/Domenico Stinellis)

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Great Britain's Prince William looks at the interior of a Airbus helicopter with his son Prince George in Hamburg, Germany, Friday, July 21, 2017. Hamburg is the last leg of the royal couple's Germany visit. (Christophe Gateau/dpa via AP)

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In this Tuesday, July 25, 2017 photo, a bee approaches a spikate checkerbloom in the Lower Carpenter Valley near Truckee, Calif. The wild Sierra Nevada meadow hidden from public view for more than a century is opening for tours after it was purchased by conservation groups. The Lower Carpenter Valley land north of Lake Tahoe contains rare carnivorous plants and threatened birds and serves as a migration corridor for other species. (AP Photo/Rich Pedroncelli)

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In this Tuesday, July 25, 2017 photo, one of the various types of butterflies that inhabit the Lower Carpenter Valley lands on a plant near Truckee, Calif. The wild Sierra Nevada meadow hidden from public view for more than a century is opening for tours after it was purchased by conservation groups. (AP Photo/Rich Pedroncelli)

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In this Tuesday, July 25, 2017 photo, the North Fork of Prosser Creek flows through the Lower Carpenter Valley near Truckee, Calif. The wild Sierra Nevada meadow hidden from public view for more than a century is opening for tours after it was purchased by conservation groups. The North Fork of Prosser Creek was once home to native Lahontan cutthroat trout, a threatened species that could be reintroduced if no natural population has remains. (AP Photo/Rich Pedroncelli)

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In this Tuesday, July 25, 2017 photo a goldenrod blooms in the Lower Carpenter Valley near Truckee, Calif. The wild Sierra Nevada meadow hidden from public view for more than a century is opening for tours after it was purchased by conservation groups. (AP Photo/Rich Pedroncelli)

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In this Tuesday, July 25, 2017 photo, clouds float near the Lower Carpenter Valley near Truckee, Calif. The wild Sierra Nevada meadow hidden from public view for more than a century is opening for tours after it was purchased by conservation groups. The Lower Carpenter Valley land north of Lake Tahoe contains rare carnivorous plants and threatened birds and serves as a migration corridor for other species. (AP Photo/Rich Pedroncelli)

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A display holds solar eclipse glasses in the American Paper Optics factory in Bartlett, Tenn., on Wednesday, June 21, 2017. Staring at the sun during an eclipse _ or anytime _ can cause eye damage. The only safe way is to protect your eyes with special filters in glasses or other devices. (AP Photo/Adrian Sainz)