Environment

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A San Francisco Municipal Transit Agency officer directs traffic during a power outage in San Francisco, Friday, April 21, 2017. A power outage struck a wide area of San Francisco on Friday, blacking out about 90,000 utility customers, snarling traffic as intersection signals went dark and stopping the famed cable cars for a time. Pacific Gas & Electric crews were assessing the problem and there was no immediate estimate for restoration of electricity. (AP Photo/Jeff Chiu)

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Kate Davis, from left, Alex Rodriguez, Molly Gasch and Marissa Osowsky work on steps across from their office at ‎BBDO San Francisco during a power outage in San Francisco, Friday, April 21, 2017. A power outage struck a wide area of San Francisco on Friday, blacking out about 90,000 utility customers, snarling traffic as intersection signals went dark and stopping the famed cable cars for a time. Pacific Gas & Electric crews were assessing the problem and there was no immediate estimate for restoration of electricity. (AP Photo/Jeff Chiu)

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In this Thursday, April 20, 2017 photo, Rosanne Hoss puts books onto a shelf at the Le Mars Public Library's temporary location in the Eagle's Club building, in Le Mars, Iowa. Volunteers are moving the library's collection across the street from the library to the Eagles before the start of a $350,000 renovation project at the library building. The renovations are expected to be finished in September. (Tim Hynds/Sioux City Journal via AP)

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The Montgomery Bay Area Rapid Transit station is dark following a power outage Friday, April 21, 2017, in San Francisco. A wide area of San Francisco has been hit by a power outage. The blackout hit at midmorning Friday in the Financial District and other areas. (AP Photo/Jocelyn Gecker)

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This April 12, 2017 image provided by NASA shows planet Earth and the moon, center left, as small points of light behind the rings of Saturn, captured by the Cassini spacecraft, 870 million miles (1.4 billion kilometers) away from Earth. Launched in 1997, Cassini reached Saturn in 2004 and has been exploring it from orbit ever since. Cassini’s fuel tank is almost empty, so NASA has opted for a risky, but science-rich grand finale. (NASA via AP)

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This image made by the Cassini spacecraft and provided by NASA on March 12, 2006, shows two of Saturn's moons, the small Epimetheus and smog-enshrouded Titan, with Saturn's A and F rings stretching across the frame. Launched in 1997, Cassini reached Saturn in 2004 and has been exploring it from orbit ever since. Cassini’s fuel tank is almost empty, so NASA has opted for a risky, but science-rich grand finale. (AP Photo/NASA)

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This undated photo made available by NASA shows one of Saturn's moons, Mimas, dwarfed by the planet's rings. Launched in 1997, Cassini reached Saturn in 2004 and has been exploring it from orbit ever since. Cassini’s fuel tank is almost empty, so NASA has opted for a risky, but science-rich grand finale. (NASA/JPL-Caltech/Space Science Institute via AP)

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In this undated photo provided by the European Space Agency, ESA, analysts at work in the space debris facility located at ESA's ESOC mission control centre, Darmstadt, Germany. Decades' worth of man-made junk is cluttering up Earth's orbit, posing a threat to spaceflight and the satellites we rely on for weather reports, air travel and global communications. More than 750,000 fragments larger than a centimeter are already thought to orbit Earth, and each one could badly damage or even destroy a satellite. (Roberto Palmari/ESA via AP)

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SAIC-GM president Wang Yongping announces the global launch of the Buick Velite 5, an extended range electric hybrid, during a global launch event ahead of the Shanghai Auto 2017 show in Shanghai, China, Tuesday, April 18, 2017. At the auto show, the global industry's biggest marketing event of the year, almost every global and Chinese auto brand is showing at least one electric concept vehicle, if not a market-ready model. (AP Photo/Ng Han Guan)

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This 1930's era photo supplied by the U.S. Department of Agriculture, Forest Service shows the general merchandise store in Tiller, Ore. Almost all of the downtown in Tiller, a dying timber town in remote southwestern Oregon, is for sale for $3.5 million and the elementary school is for sale separately for $350,000. A potential buyer has come forward but is remaining anonymous -- and back-up offers are still being accepted. (U.S. Department of Agriculture, Forest Service via AP)

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This 1930's era photo supplied by the U.S. Department of Agriculture, Forest Service shows a crew of forest workers in Tiller, Ore. Almost all of the downtown in Tiller, a dying timber town in remote southwestern Oregon, is for sale for $3.5 million and the elementary school is for sale separately for $350,000. A potential buyer has come forward but is remaining anonymous -- and back-up offers are still being accepted. (U.S. Department of Agriculture, Forest Service via AP)

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This 1930's era photo supplied by the U.S. Department of Agriculture, Forest Service shows a scene in Tiller, Ore. Almost all of the downtown in Tiller, a dying timber town in remote southwestern Oregon, is for sale for $3.5 million and the elementary school is for sale separately for $350,000. A potential buyer has come forward but is remaining anonymous -- and back-up offers are still being accepted. (U.S. Department of Agriculture, Forest Service via AP)

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A view of a fire-damaged campaign sign along Carole Lane in Princess Anne, Md., Saturday, April 15, 2017. Officials have charged two women from the Baltimore area in connection with the burning of a billboard promoting President Donald Trump. (Deborah Gates/The Daily Times via AP)

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This March 10, 2017 photo shows a preserved sharecropper's cabin at Tallahatchie Flats in Greenwood, Miss. The simple rustic cabins are rented out to visitors by the night. Sharecroppers and tenant farmers, most of them African-Americans living in desperate poverty, worked the region's cotton plantations in the decades before the industry was mechanized. (AP Photo/Beth J. Harpaz)

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This March 9, 2017 photo shows cypress trees in the Mississippi Delta. The fertile soil of the region's alluvial forests made them ideal for growing cotton. The region's unique style of blues music came largely from African-Americans who eked out a living on the Delta's cotton plantations. (AP Photo/Beth J. Harpaz)

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Apple blossoms are covered with near Denzlingen, southwestern Germany, Thursday, April 20, 2017. During temperatures below zero the layer of ice is to prevent the blossoms and apple trees from frost damages. (Patrick Seeger/dpa via AP)

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Apple blossoms are covered with near Denzlingen, southwestern Germany, Thursday, April 20, 2017. During temperatures below zero the layer of ice is to prevent the blossoms and apple trees from frost damages. (Patrick Seeger/dpa via AP)

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In this photo taken Aug. 4, 2009 file photo, a crop duster sprays a field of crops just outside Headland, Ala. Dow Chemical is pushing the Trump administration to scrap the findings of federal scientists who point to a family of widely used pesticides as harmful to about 1,800 critically threatened or endangered species. (AP Photo/Dave Martin, File)

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In this Monday, April 17, 2017 photo released by China's Xinhua News Agency, a Long March 7 rocket carrying the Tianzhou 1 is transferred to the launching site in Wenchang, south China's Hainan Province. China is preparing to launch its first unmanned cargo spacecraft on a mission to dock with the country's space station. The Tianzhou 1 was due to blast off at 7:41 p.m. (1141 GMT) Thursday atop a latest-generation Long March 7 rocket from China's newest spacecraft launch site. (Ju Zhenhua/Xinhua via AP)

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In this Monday, April 17, 2017 photo released by China's Xinhua News Agency, a Long March 7 rocket carrying the Tianzhou 1 is transferred to the launching site in Wenchang, south China's Hainan Province. China is preparing to launch its first unmanned cargo spacecraft on a mission to dock with the country's space station. The Tianzhou 1 was due to blast off at 7:41 p.m. (1141 GMT) Thursday atop a latest-generation Long March 7 rocket from China's newest spacecraft launch site. (Zeng Tao/Xinhua via AP)