Environment

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FILE - In this Sept. 9, 2016 file photo, a South Korean marine watches a TV screen reporting about North Korea's possible nuclear test at the Seoul Railway Station in Seoul, South Korea. North Korea has conducted five nuclear tests, the first in 2006. All were conducted in the depths of Mount Mantap, a nondescript granite peak in the remote and heavily forested Hamgyong mountain range about 80 kilometers (50 miles) as the crow flies from Chongjin, the nearest big city. Since North Korea is the only country in the world that still conducts nuclear weapons tests, its Punggye-ri site on _ or mostly under _ Mount Mantap is also the world’s only active nuclear testing site. The letters on the screen read: "Explosion suspect." (Kim Ju-sung/Yonhap via AP, File)

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FILE - In this Sept. 9, 2016 file photo, a man watches a TV news program reporting North Korea's nuclear test at Seoul Railway Station in Seoul, South Korea. North Korea has conducted five nuclear tests, the first in 2006. All were conducted in the depths of Mount Mantap, a nondescript granite peak in the remote and heavily forested Hamgyong mountain range about 80 kilometers (50 miles) as the crow flies from Chongjin, the nearest big city. Since North Korea is the only country in the world that still conducts nuclear weapons tests, its Punggye-ri site on - or mostly under - Mount Mantap is also the world’s only active nuclear testing site. The letters on the screen read: "Hydrogen bomb test." (AP Photo/Ahn Young-joon, File)

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Texas Department of Public Safety troopers investigate a two-vehicle crash that left several storm chasers dead Tuesday , March 28, 2017, near Spur, Texas. Tornadoes had been reported nearby at the time of the crash and heavy rain had been reported in the area, according to the National Weather Service. (Ellysa Gonzalez/Lubbock Avalanche-Journal via AP)

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Illustration on the negatives of the Paris climate accords by Alexander Hunter/The Washington Times

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Rescue teams work on the debris of a destroyed house to recover the bodies of people killed during fighting between Iraqi security forces and Islamic State militants. (Associated Press)

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FILE - In a Tuesday, May 5, 2015 file photo, North Carolina Lt. Gov. Dan Forest, left, and Gov. Pat McCrory applaud the unanimous votes by the Council of State to sell 308 acres at the old Dorothea Dix to the City of Raleigh for $52 million in Raleigh, N.C. Forest, the top Republican in North Carolina’s executive branch, is throwing a blunt counterpunch to the Democratic governor’s call to repeal the state’s “bathroom bill,” despite economic losses stemming from the legislation that’s stirred up fierce debates about gender. (Robert Willett/The News & Observer via AP, File)

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President Donald Trump, accompanied by from left, Vice President Mike Pence, Environmental Protection Agency (EPA) Administrator Scott Pruitt, and Interior Secretary Ryan Zinke, speaks at EPA headquarters in Washington, Tuesday, March 28, 2017, prior to signing an Energy Independence Executive Order. Trump signed an executive order aimed at moving forward on his campaign pledge to unravel former President Barack Obama's plan to curb global warming. (AP Photo/Pablo Martinez Monsivais)

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FILE - This March 16, 2017 file photo released by the Bannock County Sheriff's Office shows a cyanide device in Pocatello, Idaho. The cyanide device, called M-44, is spring-activated and shoots poison that is meant to kill predators. The device that doused a 14-year-old boy and killed his dog was placed on public land despite a document by federal officials stating they would avoid such areas to reduce the risk of exactly what happened. The U.S. Department of Agriculture in November said it would not put the M-44 devices on public land in Idaho. But the U.S. Bureau of Land Management says GPS coordinates put the device on BLM land near Pocatello. (Bannock County Sheriff's Office via AP, File)

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In this March 17, 2017 photo, Canyon Mansfield, 14, holds the collar of his dog, Casey, who was killed March 16 by a cyanide-ejecting device placed on public land near his Pocatello, Idaho, home by federal workers to kill coyotes. The cyanide device, called an M-44, is spring-activated and shoots poison that is meant to kill predators. The U.S. Department of Agriculture in November said it would not put the devices on public land in Idaho. (Jordon Beesley/Idaho State Journal via AP)

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Katie Carrot enters one of the stick forts she has created in one of the parks around the Twin Cities in Minneapolis on Monday, March 13, 2017. The forts, which Carrot calls environmental sculptures, are made of large branches and stone, one of them even features a "tile floor" made of large flat rocks. (Evan Frost/Minnesota Public Radio via AP)

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Katie Carrot and her dog, Jiggy, stand for a portrait inside a park in Minneapolis on Monday, March 13, 2017. In addidition to building forts, Carrot also weaves baskets out of material she finds in the woods. The forts, which Carrot calls environmental sculptures, are made of large branches and stone, one of them even features a "tile floor" made of large flat rocks. (Evan Frost/Minnesota Public Radio via AP)

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President Donald Trump, accompanied by from left, Vice President Mike Pence, Environmental Protection Agency (EPA) Administrator Scott Pruitt, and Interior Secretary Ryan Zinke, speaks at EPA headquarters in Washington, Tuesday, March 28, 2017, prior to signing an Energy Independence Executive Order. Trump signed an executive order aimed at moving forward on his campaign pledge to unravel former President Barack Obama's plan to curb global warming. (AP Photo/Pablo Martinez Monsivais)

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FILE - In this Feb. 18, 2009, file photo, the shadow of a helicopter hovers over feral pigs near Mertzon, Texas. Oklahoma lawmakers are considering a bill to allow hunters to shoot feral hogs from helicopters. Aerial gunners are already used to help control feral swine in Oklahoma, but the work can only be done by trained, licensed contractors with support from the Oklahoma Department of Agriculture Food and Forestry. (AP Photo/Eric Gay, File)

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FILE - In this April 4, 2013, file photo, a dragline excavator moves rocks above a coal seam at the Spring Creek Mine in Decker, Mont. President Trump's latest move to support coal mining is unlikely to turn around the industry's prospects immediately. Experts say the biggest problem faced by the mining industry today isn't a coal shortage of coal or even the prospect of climate change regulations, but an abundance of cheap natural gas. (AP Photo/Matthew Brown, File)

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FILE - In this July 1, 2013, file photo, smoke rises from the Colstrip Steam Electric Station, a coal burning power plant in Colstrip, Mont. President Trump's latest move to support coal mining is unlikely to turn around the industry's prospects immediately. Experts say the biggest problem faced by the mining industry today isn't a coal shortage of coal or even the prospect of climate change regulations, but an abundance of cheap natural gas. (AP Photo/Matthew Brown, File)

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FILE - In this Jan. 9, 2014, file photo, rail cars are filled with coal and sprayed with a topper agent to suppress dust at Cloud Peak Energy's Antelope Mine north of Douglas, Wyo. President Trump's latest move to support coal mining is unlikely to turn around the industry's prospects immediately. Experts say the biggest problem faced by the mining industry today isn't a coal shortage of coal or even the prospect of climate change regulations, but an abundance of cheap natural gas. (Ryan Dorgan/Casper Star-Tribune via AP, File)

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FILE - In this Nov. 15, 2016 file photo, a haul truck with a 250-ton capacity carries coal from the Spring Creek strip mine near Decker, Mont. President Trump's latest move to support coal mining is unlikely to turn around the industry's prospects immediately. Experts say the biggest problem faced by the mining industry today isn't a coal shortage of coal or even the prospect of climate change regulations, but an abundance of cheap natural gas. (AP Photo/Matthew Brown, File)

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FILE - In this Feb. 15, 2017, file photo, North Carolina State's Dennis Smith Jr. (4) shoots against North Carolina during the the first half of an NCAA college basketball game in Raleigh, N.C. Smith, the Atlantic Coast Conference freshman of the year, is headed to the NBA after one season with the Wolfpack. (AP Photo/Gerry Broome, File)

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In this 2016 photo released by Thailand's Department of National Parks, Wildlife and Plant Conservation/Freeland, two tiger cubs investigate a rock along a forest trail as their mother walks past in the jungle in eastern Thailand. Thailand's Department of National Parks, Wildlife and Plant Conservation, Freeland, an organization fighting human and animal trafficking, and Panthera, a wild cat conservation organization, announced Tuesday, March 28, 2017 that their investigations had photographic evidence of new tiger cubs in eastern Thailand's jungle, signaling the existence of the world's second breeding population of endangered Indochinese tigers. (Thailand's Department of National Parks, Wildlife and Plant Conservation/Freeland via AP)