Environment

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Ivanpah Solar Electric Generating System (ISEGS) in Calif., the largest facility of its kind in the world, suffered a fire on Wednesday, May 18, 2016. (San Bernardino County Fire Department via the Associated Press)

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Nebraska Gov. Pete Ricketts pumps E-85 ethanol blend fuel into a car whose driver reacts to the presence of photographers, while visiting the Sapp Brothers Travel Center in Omaha, Neb., Thursday, May 19, 2016, to promote renewable fuels month in Nebraska. (AP Photo/Nati Harnik) ** FILE **

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This May 12, 2016, file image provided by NASA shows the planet Mars. (NASA/ESA/Hubble Heritage Team - STScI/AURA, J. Bell - ASU, M. Wolff - Space Science Institute via AP)

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Louisiana Gov. John Bel Edwards signs a bill to expand and jump-start Louisiana's medical marijuana program, on Thursday, May 19, 2106, in Baton Rouge, La. (AP Photo/Melinda Deslatte)

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Interview with Thomas Lake.

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Wisconsin Gov. Scott Walker speaks at a news conference in Madison on Sept. 21, 2015. (Associated Press)

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Tuan Tuan at the Taipei Zoo, in Taipei, Taiwan. (Taipei Zoo via AP)

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George Washington

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Olympiakos' Manuel Da Costa, left, runs to stop AEK Athens' Rafik Djebbour as he controls the ball during the Greek Final Cup at the Olympic Stadium of Athens, on Tuesday, May 17, 2016. (AP Photo/Thanassis Stavrakis)

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An examination dish containing dead mosquitoes sits under a microscope on Tuesday, May 17, 2016, in Brownsville, Texas. The exhibit was part of a display of tools public health offficials use to capture and combat mosquitos. A panel of local experts and officials discussed the threat Zika brings and ways to minimize its spread in the Rio Grande Valley, a major thoroughfare of international trade and travel. (Jason Hoekema/The Brownsville Herald via AP)

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An RQ-21A Blackjack small tactical unmanned aircraft system flies over a field near Naval Air Station Patuxent River, Md., June 12, 2013. (U.S. Navy)

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A hike through forests to a scenic spot overlooking the Danube River comes with a legend of good fortune for all who go there.

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People light candles during a ceremony to mark the first month of the earthquake that hit the area of Manabi and Esmeraldas, in Quito, Ecuador, Monday, May 16, 2016. A month after the magnitude 7.8 earthquake many Ecuadorians are still struggling. (AP Photo/Dolores Ochoa)

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Kayakers listen to a talk on eelgrass and the care that should be taken in not disturbing it near Seafarer's Memorial Park in Anacortes, Wash., Friday, May 13, 2016. Hundreds of people in kayaks and on foot gathered at the site of two oil refineries in Washington state to call for action on climate change and a fair transition away from fossil fuels. (Scott Terrell/Skagit Valley Herald via AP) MANDATORY CREDIT

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Craighead Beringia South biologist Bryan Bedrosian releases one of several eagles he's equipped with tracking devices back into the wild on Dec. 1, 2009 on the National Elk Refuge near Jackson, Wyo. (Bradley J. Boner/Jackson Hole News & Guide via AP) **FILE**