Environment

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FILE - In this Feb, 12, 2015 file photo, Jenna Jambeck, an environment engineering professor at the University of Georgia, holds a plastic baggie with trash collected from a clean up at Panama Beach, Fla., at the AAAS (American Association for the Advancement of Science) conference in San Jose, Calif. A new massive study finds that production of plastic and the hard-to-breakdown synthetic waste is soaring in huge numbers. The study says since 1950, industry has made more than 9 billion tons of plastics. That’s enough to cover the entire country of Argentina ankle deep in the stuff. (AP Photo/Seth Borenstein)

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FILE - In this Jan. 21, 2016 file photo, Indian rag pickers look for reusable materials at a garbage dump littered with polythene bags in Lucknow, India. A new massive study finds that production of plastic and the hard-to-breakdown synthetic waste is soaring in huge numbers. The study says since 1950, industry has made more than 9 billion tons of plastics. That’s enough to cover the entire country of Argentina ankle deep in the stuff. (AP Photo/Rajesh Kumar Singh)

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FILE - In this March 12, 2015 file photo, plastic trash is compacted into bales ready for further processing at the waste processing dump on the outskirts of Minsk, Belarus. A new massive study finds that production of plastic and the hard-to-breakdown synthetic waste is soaring in huge numbers. The study says since 1950, industry has made more than 9 billion tons of plastics. That’s enough to cover the entire country of Argentina ankle deep in the stuff. (AP Photo/Sergei Grits)

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Flames from a backfire burn as CalFire crews battle the Ditwiler Fire near Mariposa, Calif., on Tuesday, July 18, 2017. Record rain and snowfall in the mountains this winter was celebrated for bringing California's five-year drought to its knees, but it has turned into a challenge for firefighters battling flames feeding on dense vegetation, officials said. (AP Photo/Noah Berger)

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FILE - In a Friday, July 7, 2017 file photo, commuters arrive in the New Jersey Transit portion of New York's Pennsylvania Station. a day after an Amtrak train was involved in a slow-speed derailment at Penn Station. A report shows that a faulty track condition caused the July 6 derailment at New York’s Penn Station in an area where Amtrak is performing repairs that are causing service cutbacks for hundreds of thousands of commuters this summer. (AP Photo/Richard Drew, File)

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FILE - In this April 8, 2014, file photo, newly hired Wake Forest men's basketball coach Danny Manning, left, shakes hands with athletic director Ron Wellman as he is introduced to students and supporters at a rally at the school in Winston-Salem, N.C. Wake Forest’s highest-profile teams took a collective step forward last year, and athletic director Ron Wellman hopes they can keep that momentum going in 2017-18. (AP Photo/Chuck Burton, File)

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FILE - In this Jan. 22, 2014, file photo, Wake Forest University Athletic Director Ron Wellman speaks during a new conference, in Arlington, Texas. Wake Forest’s highest-profile teams took a collective step forward last year, and athletic director Ron Wellman hopes they can keep that momentum going in 2017-18. (AP Photo/Tony Gutierrez, File)

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Flames from a backfire burn above fire trucks as CalFire crews battle the wildfires near Mariposa, Calif., on Tuesday, July 18, 2017. Record rain and snowfall in the mountains this winter was celebrated for bringing California's five-year drought to its knees, but it has turned into a challenge for firefighters battling flames feeding on dense vegetation, officials said. (AP Photo/Noah Berger)

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A firefighter sprays water on a back fire while battling the wildfires near Mariposa, Calif., on Tuesday, July 18, 2017. Record rain and snowfall in the mountains this winter was celebrated for bringing California's five-year drought to its knees, but it has turned into a challenge for firefighters battling flames feeding on dense vegetation, officials said. (AP Photo/Noah Berger)

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Flames from a backfire burn as CalFire crews battle the wildfires near Mariposa, Calif., on Tuesday, July 18, 2017. Record rain and snowfall in the mountains this winter was celebrated for bringing California's five-year drought to its knees, but it has turned into a challenge for firefighters battling flames feeding on dense vegetation, officials said. (AP Photo/Noah Berger)

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In this July 6, 2017 photo, Brazil's first skyscraper is seen behind palm trees in Praca Maua, at the heart of the renovated port area in Rio de Janeiro, Brazil. The 22-story building named "The Night" was constructed in 1929 and is part of Brazil's national heritage. A new app called “Museum of Yesterday” seeks to educate visitors about the history and role of Rio de Janeiro’s revitalized port in colonization, slavery and even recent corruption investigations. (AP Photo/Renata Brito)

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A highway sign warns drivers along Interstate 25 not to stop during a cattle drive on Hynds Boulevard during the annual 121st Cheyenne Frontier Days cattle drive on Sunday morning, July 16, 2017 in Cheyenne, Wyo. More than 500 head of cattle were driven from Horse Creek Road down to Frontier Park, with hundreds of spectators lining the roads. (Jacob Byk/Wyoming Tribune Eagle via AP)

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Pivotal point: A deadly crash at the Fort Totten Metro Station in June 2009 brought to light the safety issues with the transit system's 1000 Series rail cars. Officials likened the effect to a collapsing telescope.) (Associated Press)

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Metro has removed the last of its 1000 Series rail cars and 4000 Series rail cars from the tracks and replaced them with the safer 7000 Series. (Associated Press)

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California Gov. Jerry Brown (center) said that the Golden State had a moral duty to act on efforts to combat climate change, and applauded the state's bipartisan cap and trade extension. "Tonight California stood tall and once again, boldly confronted the existential threat of our time," Mr. Brown said of the state's initiative. (Associated Press)

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Lang Farms, near Eden Valley, Minn., where vandals dismantled a fence and released late Sunday or early Monday mink from the farm into the wild, Tuesday, July 18, 2017. Authorities say they believe animal rights activists set free from a pelt farm in central Minnesota about 35,000 mink incapable of surviving in the wild. (Jason Wachter/St. Cloud Times via AP)