Environment

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In this photo taken Sunday, April 16, 2017, the Theewaterskloof Dam, a key source of water supply to Cape Town, South Africa, is shown at low levels. The city, a major international tourist attraction, is instructing people to severely restrict water use because of the area's worst drought in more than a century. (AP Photo/Halden Krog)

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In this photo taken Sunday, April 16, 2017, the Theewaterskloof Dam, a key source of water supply to Cape Town, South Africa, is shown at low levels. The city, a major international tourist attraction, is instructing people to severely restrict water use because of the area's worst drought in more than a century. (AP Photo/Halden Krog)

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In this Monday, May 22, 2017 photo, South Korean army's K-55 self-propelled howitzer fires during the annual exercise in Paju, near the border with North Korea, South Korea. South Korea's military said Tuesday, May 23, 2017, it fired warning shots at an unidentified object flying south from rival North Korea. (Lim Byung-shick/Yonhap via AP)

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In this May 18, 2017 photo, Syrian walking among damaged buildings on a street filled with debris at the mountain resort town of Zabadani in the Damascus countryside, Syria. Once a popular summer resort famed for its fruit trees and favored by tourists from rich Gulf Arab countries, Zabadani is now a deserted, endless vista of pulverized buildings after thousands of rebels were driven out along with the town's original inhabitants. (AP Photo/Hassan Ammar)

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Illustration on the notion of government subsidy of nuclear power by Alexander Hunter/The Washington Times

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In this photo taken May 18, 2017, a sign indicates a radio station that provides emergency information for the Hanford Nuclear Reservation near Richland, Wash. The U.S. Department of Energy said Monday, May 22, 2017, that workers have finished installing a protective cover over a partially-collapsed tunnel that contained radioactive waste at the facility. (AP Photo/Nicholas K. Geranios)

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FILE - In this Tuesday, May 31, 2016 file photograph, Nelly Morales, from left, Michelle Young and Dawn Stein are photographed on Stein's property next to an oil well complex in Greeley, Colo. Residents of the neighborhood sued the state of Colorado on Friday, May 19, 2017, saying oil and gas regulators have not done enough to protect them from the disruption and danger of the big energy facility being constructed in a pasture surrounded by homes west of Greeley. (AP Photo/Brennan Linsley, File)

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In this undated image released by PBS, a brown bear catches salmon at Brooks Falls Katmai National Park and Preserve in Alaska. PBS is collaborating with the BBC on a live nature series set in Alaska this July, where cameras will attempt to capture bears, eagles, wolves and whales in their natural habitat. (Gareth Wildman/PBS via AP)

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FILE - This April 12, 2012 file photo shows the clarity of Lake Tahoe near Incline Village, Nev. Climate change is changing the rules of nature scientists have followed for decades as they try to identify the causes of Lake Tahoe's loss of clarity and chart a course to restore the ecological health of the cobalt mountain waters dubbed the ''crown jewel'' of the Sierra. (AP Photo/Scott Sonner, File)

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Drake accepts the award for top Billboard 200 album for "Views" at the Billboard Music Awards at the T-Mobile Arena on Sunday, May 21, 2017, in Las Vegas. Drake surpassed Adele's record at the 2017 Billboard Music Awards on Sunday, picking up 13 awards. (Photo by Chris Pizzello/Invision/AP)

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FILE - In this April 16, 2012, file photo, a small, likely juvenile, bobcat is perched on a power pole in a residential neighborhood of Victorville, Calif. Bobcat numbers have almost tripled nationwide since the 1980s to as many as 3.6 million, according to a 2010 study in the Journal of Fish and Wildlife Management, the most recent national survey. (James Quigg/The Daily Press via AP, File)

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Gwen Stefani, left, presents the Billboard Icon award to Cher at the Billboard Music Awards at the T-Mobile Arena on Sunday, May 21, 2017, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

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Drake accepts the award for top Billboard 200 album for "Views" at the Billboard Music Awards at the T-Mobile Arena on Sunday, May 21, 2017, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

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California Gov. Jerry Brown called opponents of instate gas price increases "freeloaders," which has been pounced on by the state GOP. (Associated Press)

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In this May 2017 photo, a tractor-pulled tree-planting unit creates a furrow and lays down drip tape from a large roll before individual trees are dropped into the furrow at set intervals by hand, at a site southwest of Kearney, Neb. Sixty-one red cedars, 38 ponderosa pines and 94 chokecherry seedlings were planted by a crew from Jaeger Enterprises of Ogallala, the planting contractor for Holdrege-based Tri-Basin Natural Resources District. (Lori Potter /The Daily Hub via AP)

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This May 2016 photo provided by Matt Tarr shows a prairie warbler in southeastern New Hampshire. Scientists will be banding scores of song birds in 2017 like the prairie warbler to better understand how they are using forests in New Hampshire and Maine that have been changed either by transmission lines or logging. (Matt Tarr via AP)

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ADVANCE FOR WEEKEND EDITIONS - In this April 28, 2017, photo, Salish Sea Stewards volunteer Tom Flanagan ventures out into the mud at low tide in Fidalgo Bay to set a trap in order to monitor for green crabs in Anacortes, Wash. (Scott Terrell/Skagit Valley Herald via AP)

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Anaheim Ducks center Ryan Getzlaf (15) congratulates goalie John Gibson (36) after the Ducks beat the Nashville Predators in overtime in Game 4 of the Western Conference final in the NHL hockey Stanley Cup playoffs Thursday, May 18, 2017, in Nashville, Tenn. The Ducks won 3-2 to even the series 2-2. (AP Photo/Mark Humphrey)

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Sen. Tom Cotton, Arkansas Republican, questions Federal Reserve Chair Janet Yellen as she testifies in front of the Senate Banking Committee in Washington on Feb. 14, 2017. (Associated Press) **FILE**

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In this April 27, 2017, photo, Gabe Ablin, 21, an Environmental Ethics & Policy major at the University of Portland, stands near a series of raised flower beds as part of a project that hopes to create a habitat for the monarch butterfly in Portland, Ore. One year after first planting various milkweed seeds, Vigor intern Ablin will be one of over 700 UP undergraduates collecting a diploma Saturday. (Beth Nakamura/The Oregonian via AP)