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In this July 13, 2017 photo, a farmer takes advantage of a motorized boat to move faster along the channels of Xochimilco to his floating farm known as a "chinampa" in Mexico City. Xochimilco, on the far southern edge of Mexico City, has been a breadbasket for the Valley of Mexico since before the Aztec Empire, when farmers first created the “floating” islands bound to the shallow canal beds through layers of sediment and willow roots. (AP Photo/Marco Ugarte)

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In this July 13, 2017 photo, men remove mud from a shallow channel so that tourist boats will be able to move through the channel, in Xochimilco, Mexico City. Some of Mexico City’s most in-demand restaurants are increasingly incorporating produce grown at the famed aquatic gardens of Xochimilco (AP Photo/Marco Ugarte)

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In this July 13, 2017 photo, a farmer's machete and hat sit on a floating farm known as a "chinampa" in Xochimilco, Mexico City. The World Heritage status and Xochimilco itself are threatened by the pollution and encroaching urbanization that plague the rest of the sprawling metropolis. (AP Photo / Marco Ugarte)

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In this July 13, 2017 photo, a farmer paddles his canoe to his floating farm known as a "chinampa," in Xochimilco, Mexico City. Xochimilco is designated by UNESCO as a World Heritage site. (AP Photo/Marco Ugarte)

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In this July 13, 2017 photo, chefs and restaurant employees walk through a vegetable garden on a floating farm known as a "chinampa" in Xochimilco, Mexico City. Xochimilco has also been a breadbasket for the Valley of Mexico since before the Aztec Empire, when farmers first created the “floating” islands bound to the shallow canal beds through layers of sediment and willow roots. (AP Photo/Marco Ugarte)

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Flames rise behind a vacant house as a firefighter works to halt the Detwiler wildfire near Mariposa, Calif., on Wednesday, July 19, 2017. As wildfires rage throughout the western U.S., one California blaze in the rugged mountains outside of Yosemite National Park forced thousands of nearby residents to flee their homes. (AP Photo/Noah Berger)

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A chimney stands at a burned residence on Yaqui Gulch Road as a wildfire burns near Mariposa, Calif., on Wednesday, July 19, 2017. The fire has forced thousands of people from homes in and around a half-dozen small communities, officials said. (AP Photo/Noah Berger)

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An air tanker drops retardant while battling a wildfire near Mariposa, Calif., on Wednesday, July 19, 2017. The fire has forced thousands of people from homes in and around a half-dozen small communities, officials said. (AP Photo/Noah Berger)

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An air tanker drops retardant while battling a wildfire fire near Mariposa, Calif., on Wednesday, July 19, 2017. According to fire officials, the blaze has scorched more than thousands of acres and destroyed multiple structures. (AP Photo/Noah Berger)

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A chimney stands at a burned residence on Yaqui Gulch Road as a wildfire burns near Mariposa, Calif., on Wednesday, July 19, 2017. The fire has forced more than 4,000 people from homes in and around a half-dozen small communities, officials said (AP Photo/Noah Berger)

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An air tanker drops retardant while battling a wildfire near Mariposa, Calif., Wednesday, July 19, 2017. The fire has forced thousands of people from homes in and around a half-dozen small communities, officials said. (AP Photo/Noah Berger)

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FILE - In this July 17, 2017 file photo Gov. Jerry Brown, center, is flanked by lawmakers from both sides of the aisle as he discusses the passage of a pair of climate change measures at a Capitol news conference in Sacramento, Calif. Brown and legislative leaders managed to extend California's cap-and-trade law thanks in part to tax breaks that benefit businesses and agriculture. The provision helped bring support from Republicans and moderate Democrats. (AP Photo/Rich Pedroncelli, File)

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In this July 17, 2017 file photo Gov. Jerry Brown, discusses the passage of a pair of climate change measures,at a Capitol news conference in Sacramento, Calif. (AP Photo/Rich Pedroncelli,File)

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Illustration on the BNP and terrorism in Bangladesh by Alexander Hunter/The Washington Times

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FILE - In this Dec. 13, 2016 file photo, actor Forest Whitaker poses for photographers at the "Rogue One: A Star Wars Story" premiere in London. Whitaker will guest-star in a multi-episode arc on “Empire” this fall. “Empire” returns for its new season Sept. 27. (Photo by Joel Ryan/Invision/AP, File)

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First officer Jukka Vuosalmi sits at the controls of the Finnish icebreaker MSV Nordica as it sets sail in the North Pacific Ocean toward the Bering Strait, Friday, July 7, 2017. A group of international researchers is sailing into the Arctic Sea aboard the Finnish icebreaker to traverse the Northwest Passage and record the environmental and social changes that are taking place in one of the most forbidding corners of the world. (AP Photo/David Goldman)

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Trainee Jussi Mikkotervo looks out from the bow of the Finnish icebreaker MSV Nordica as it sails through ice floating on the Beaufort Sea off the coast of Alaska while traversing the Arctic's Northwest Passage, Sunday, July 16, 2017. Although the passage presents an attractive shortcut for maritime traffic between the Pacific and Atlantic oceans, only a dozen or two vessels attempt to navigate the poorly charted Canadian Arctic Archipelago during the brief summer window each year. (AP Photo/David Goldman)

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FILE - In this Tuesday, July 8, 2008 file photo, boatswain Bob Taylor, of Halifax, watches as a box corer is lowered from the Canadian Coast Guard icebreaker Louis S. St-Laurent in the Davis Strait. The device gathers mud and sediment from the bottom of the ocean floor. The Louis is on its annual voyage to Canada's Arctic which will include patrols through the Northwest Passage. In addition to serving the people of Canada's North the ship is carrying a team of scientists studying climate change and the health of Canada's three oceans. (Jonathan Hayward/The Canadian Press via AP)

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Canadian ice navigator, David "Duke" Snider shows the route the Finnish icebreaker MSV Nordica will navigate on a map of current sea ice conditions as the ship sails north in the Bering Sea Tuesday, July 11, 2017. A group of international researchers is sailing into the Arctic Sea aboard the Finnish icebreaker to traverse the Northwest Passage and record the environmental and social changes that are taking place in one of the most forbidding corners of the world. (AP Photo/David Goldman)

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FILE - In this Oct. 25, 1988 file photo, one of two trapped California Gray Whales swims in a long man-made opening in the Arctic Ocean ice as two native whalers move ice away from the whale as rescue efforts continue near Barrow, Alaska. The whales had been trapped for more than two weeks. (AP Photo/Jack Smith)