Environment

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In this photo taken Wednesday, April 5, 2017, a bulletin board with pictures of Soviet state founder Vladimir Lenin hangs on a wall in a school in the deserted town of Pripyat, some 3 kilometers (1.86 miles) from the Chernobyl nuclear power plant Ukraine. Once home to some 50,000 people whose lives were connected to the Chernobyl nuclear power plant, Pripyat was hastily evacuated one day after a reactor at the plant 3 kilometers (2 miles away) exploded on April 26, 1986. The explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

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In this photo taken Wednesday, April 5, 2017, a broken clock hangs on a wall in a school in the deserted town of Pripyat, some 3 kilometers (1.86 miles) from the Chernobyl nuclear power plant Ukraine. Once home to some 50,000 people whose lives were connected to the Chernobyl nuclear power plant, Pripyat was hastily evacuated one day after a reactor at the plant 3 kilometers (2 miles away) exploded on April 26, 1986. The explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

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In this photo taken Wednesday, April 5, 2017, a decrepit piano stands in a school in the deserted town of Pripyat, some 3 kilometers (1.86 miles) from the Chernobyl nuclear power plant Ukraine. Once home to some 50,000 people whose lives were connected to the Chernobyl nuclear power plant, Pripyat was hastily evacuated one day after a reactor at the plant 3 kilometers (2 miles away) exploded on April 26, 1986. The explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

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In this photo taken Wednesday, April 5, 2017, journalists take a selfie in front of the monument of Soviet state founder Vladimir Lenin in Chernobyl, Ukraine. April 26 marks the 31st anniversary of the Chernobyl nuclear disaster. A reactor at the Chernobyl nuclear power plant exploded on April 26, 1986, leading to an explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

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In this photo taken Wednesday, April 5, 2017, a radioactivity sign stands in the ground, outside Chernobyl, Ukraine. April 26 marks the 31st anniversary of the Chernobyl nuclear disaster. A reactor at the Chernobyl nuclear power plant exploded on April 26, 1986, leading to an explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

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Ukrainians light candles at the memorial to the victims of the Chernobyl nuclear disaster, in Kiev, Ukraine, Wednesday, April 26, 2017. Ukraine marked the 31st anniversary of the Chernobyl nuclear power plant explosion. (AP Photo/Sergei Chuzavkov)

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People lay flowers to honor the memory of the victims of the Chernobyl disaster in Kiev, Ukraine, Wednesday, April 26, 2017. Ukraine marked the 31st anniversary of the Chernobyl nuclear power plant explosion. (AP Photo/Sergei Chuzavkov)

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In this photo taken Wednesday, April 5, 2017, an edition of the newspaper Sovetsky Patriot, dated three days before the nuclear explosion, is attached to a bulletin board in a house of culture in the deserted town of Pripyat, some 3 kilometers (1.86 miles) from the Chernobyl nuclear power plant Ukraine. Once home to some 50,000 people whose lives were connected to the Chernobyl nuclear power plant, Pripyat was hastily evacuated one day after a reactor at the plant 3 kilometers (2 miles away) exploded on April 26, 1986. The explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

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This photo taken Wednesday, April 5, 2017, shows a central square in the deserted town of Pripyat, some 3 kilometers (1.86 miles) from the Chernobyl nuclear power plant Ukraine. Once home to some 50,000 people whose lives were connected to the Chernobyl nuclear power plant, Pripyat was hastily evacuated one day after a reactor at the plant 3 kilometers (2 miles away) exploded on April 26, 1986. The explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

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This photo taken Wednesday, April 5, 2017, shows a gymnasium in a school in the deserted town of Pripyat, some 3 kilometers (1.86 miles) from the Chernobyl nuclear power plant Ukraine. Once home to some 50,000 people whose lives were connected to the Chernobyl nuclear power plant, Pripyat was hastily evacuated one day after a reactor at the plant 3 kilometers (2 miles away) exploded on April 26, 1986. The explosion and the subsequent fire spewed a radioactive plume over much of northern Europe. (AP Photo/Efrem Lukatsky)

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A South Korean army's K1A2 tank fires during South Korea-U.S. joint military live-fire drills at Seungjin Fire Training Field in Pocheon, South Korea, near the border with North Korea, Wednesday. April 26, 2017. (AP Photo/Ahn Young-joon)

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FILE - In this March 22, 2017 file photo, Kansas State student Reagan Butler and others from a Manhattan youth group help remove damaged fencing over thousands of acres in fire-ravaged Clark County, Ark. The Western mountains are flush with snow and California has canceled its drought emergency, but some farmers and ranchers on the high plains are struggling amid a lengthy dry spell and the aftermath of destructive wildfires. (Michael Pearce/The Wichita Eagle via AP, File)

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Agriculture Secretary Sonny Perdue applauds as President Donald Trump holds up the just signed executive order during a farmers' roundtable in the Roosevelt Room of the White House in Washington, Tuesday, April 25, 2017. (AP Photo/Andrew Harnik)

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The freeway is closed and traffic is diverted to an offramp after a fiery collision of two big trucks and several smaller vehicles killed one person and injured others while triggering a massive traffic jam on Interstate 5 just north of downtown Los Angeles, Tuesday, April 25, 2017. (AP Photo/Reed Saxon)

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Investigators view the wreckage after a fiery collision of two big trucks and several smaller vehicles killed one person and injured several others while triggering a massive traffic jam on Interstate 5 just north of downtown Los Angeles Tuesday, April 25, 2017. (AP Photo/Reed Saxon)

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A California Highway Parol officer walks past a car wedged under the wreckage of a big rig after a fiery collision of two big trucks and several smaller vehicles killed one person and injured several others while triggering a massive traffic jam on Interstate 5 just north of downtown Los Angeles Tuesday, April 25, 2017. (AP Photo/Reed Saxon)

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Investigators view the wreckage after a fiery collision of two big trucks and several smaller vehicles killed one person and injured several others while triggering a massive traffic jam on Interstate 5 just north of downtown Los Angeles Tuesday, April 25, 2017. (AP Photo/Reed Saxon)

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FILE - In this undated file photo provided by the U.S. Fish and Wildlife Service, a Mexican gray wolf leaves cover at the Sevilleta National Wildlife Refuge, Socorro County, N.M. The Denver-based 10th U.S. Circuit Court of Appeals on Tuesday, April 25, 2017, lifted a preliminary injunction that had prevented the Fish and Wildlife Service from releasing more Mexican gray wolves. (Jim Clark/U.S. Fish and Wildlife Service via AP, File)

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Investigators view the wreckage after a fiery collision of two big trucks and several smaller vehicles killed one person and injured several others while triggering a massive traffic jam on Interstate 5 just north of downtown Los Angeles Tuesday, April 25, 2017. (AP Photo/Reed Saxon)