Environment

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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)

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President Trump insisted that "the wall is going to get built." (Associated Press)

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FILE - In this Aug. 3, 2014, file photo, an algae bloom covers Lake Erie near the City of Toledo water intake crib about 2.5 miles off the shore of Curtice, Ohio. Several environmental groups in Ohio and Michigan are suing the U.S. Environmental Protection Agency, saying the agency isn't doing enough to protect Lake Erie from toxic algae. The federal lawsuit filed Tuesday, April 25, 2017, said the EPA needs to step in and take action under the Clean Water Act. Algae blooms in the shallowest of the Great Lakes have fouled drinking water in recent years and are a threat to wildlife and water quality. (AP Photo/Haraz N. Ghanbari, File)

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State Sen. Jim Nielsen, R-Gerber, right, questions Bill Croyle, acting director of the Department of Water Resources, about the damage to the spillway of the Oroville Dam, during a hearing of the Senate Natural Resources and Water Committee, Tuesday, April 25, 2017, in Sacramento, Calif. Croyle and Natural Resources Secretary John Laird, updated lawmakers on the actions taken to repair the damaged spillway that caused the evacuation of nearly 200,000 people downstream of the Oroville Dam in February. (AP Photo/Rich Pedroncelli)

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Natural Resources Secretary John Laird, right, discusses the damaged spillway on the Oroville Dam during a hearing of the Senate Committee on Natural Resources and Water, Tuesday, April 25, 2017, in Sacramento, Calif. Laird, and Bill Croyle, left, the acting director of the Department of Water Resources, updated lawmakers on the actions taken to repair the damaged spillway that caused the evacuation of nearly 200,000 people downstream of the Oroville Dam in February. (AP Photo/Rich Pedroncelli)

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Bill Croyle, left, the acting director of the Department of Water Resources, discusses the damaged spillway on the Oroville Dam during a hearing of the Senate of the Natural Resources and Water Committee, Tuesday, April 25, 2017, in Sacramento, Calif. Croyle and Natural Resources Secretary John Laird, right, updated lawmakers on the actions taken to repair the damaged spillway that caused the evacuation of nearly 200,000 people downstream of the Oroville Dam in February. (AP Photo/Rich Pedroncelli)

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Indiana Gov. Eric Holcomb speaks as Lt. Gov. Suzanne Crouch listens during a news conference at the Statehouse, Tuesday, April 25, 2017, in Indianapolis. (AP Photo/Darron Cummings)