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This undated photo provided by the Mississippi Entomological Museum shows the tiny redbay ambrosia beetle, which was first found in the U.S. in 2002. It carries a fungus that is devastating to any tree or shrub species in the laurel family. Researchers from Mississippi and Florida say one female fungus-farming beetle inadvertently imported to Georgia may have been the source of the disease that has killed some 300 million redbay trees and threatens Florida's avocado groves. (Joe A. MacGown/Mississippi Entomological Museum via AP)

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FILE - In this Tuesday, Sept. 14, 1999 file photo, Pavel Svihra, a horticultural advisor with the University of California, holds an ambrosia beetle in his palm in San Rafael, Calif. Researchers from Mississippi and Florida say a single fungus-farming beetle inadvertently imported to Georgia apparers to be the one and only source of a disease that has killed an estimated 300 million redbay trees and is threatening Florida's avocado groves. The beetle and its fungus arrived in Georgia in 2002, and their clones have spread west into Texas and north to North Carolina. (AP Photo/Eric Risberg)

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In a June 29, 2017 photo, The Clearas Water Recovery greenhouse glows purple from the LED grow lights for the algae held in glass tubes near the settling ponds in Missoula's wastewater treatment facility. Clearas has developed a patented process to use the algae to remove nitrogen and phosphorous from the plant's waste water, keeping waterways, like Missoula's Clark Fork River, free from the compounds that starve fish and plant life of oxygen by feeding algae in the river. (Tommy Martino/The Missoulian via AP)

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In a June 29, 2017 photo, company CEO Jordan Lind says there is a lot of interest in the company's technology in the Great Lakes region, in Europe and in Asia. Formed eight years ago, Clearas Water Recovery has developed a patented process to use algae to remove nitrogen and phosphorous from public wastewater treatment plants, keeping waterways from being inundated with the compounds that starve fish and plant life of oxygen. In turn, the algae can be sold to other companies for fertilizer, biofuels and other uses. (Tommy Martino/The Missoulian via AP)

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In this photo provided by South Korea Defense Ministry, A U.S. Air Force B-1B Lancer bomber, left, drops a bomb over the Korean Peninsula, South Korea Saturday, July 8, 2017. Two U.S. bombers flew to the Korean Peninsula to join fighter jets from South Korea and Japan for a practice bombing run as part of a training mission in response to North Korea's ballistic missile and nuclear programs, officials said Friday. (South Korea Defense Ministry via AP)

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File - In this Aug. 26, 2013 file photo, a fire truck drives past burning trees as firefighters continue to battle the Rim Fire near Yosemite National Park, Calif. California's emergency services director says the federal government has failed to reimburse $18 million for fighting fires on federal lands in the state. Mark Ghilarducci said in a sharply worded letter to the U.S. Forest Service chief this week that the federal agency had ignored its financial responsibility and raised the possibility the state might stop responding to fires in national forests, Friday, July 7, 2017. (AP Photo/Jae C. Hong, File)

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FILE - In this Aug. 25, 2013 file photo, firefighter A.J. Tevis watches the flames of the Rim Fire near Yosemite National Park, Calif. California's emergency services director says the federal government has failed to reimburse $18 million for fighting fires on federal lands in the state. Mark Ghilarducci said in a sharply worded letter to the U.S. Forest Service chief this week that the federal agency had ignored its financial responsibility and raised the possibility the state might stop responding to fires in national forests, Friday, July 7, 2017. (AP Photo/Jae C. Hong, File)

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RETRANSMISSION TO CHANGE TERMINOLOGY FROM PUP TO CALF - In this Wednesday, June 21, 2017, photo provided by Alaska SeaLife Center shows a walrus calf in a quarantined pen as it's cared for at the Alaska SeaLife Center, in Seward, Alaska. The calf was found on a mining barge in Nome, Alaska, and transported to the SeaLife Center, which is the only facility in Alaska that holds permits to care for stranded marine mammals. Center officials estimate the calf was two weeks old when it was found. (Jennifer Gibbins/Alaska SeaLife Center via AP)

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CORRECTS DATE - In this Friday July 7, 2017, photo provided by Alaska SeaLife Center, Dr. Kathy Woody, veterinarian at the Alaska SeaLife Center, left, and Brett Long, husbandry director, examine a walrus calf currently in the Center's I.Sea.U critical care unit in Seward, Alaska. The calf was found on a mining barge in Nome, Alaska, and transported to the SeaLife Center, which is the only facility in Alaska that holds permits to care for stranded marine mammals. Center officials estimate the calf was two weeks old when it was found. (Jennifer Gibbins/Alaska SeaLife Center via AP)

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A truck drives through the flooded Marathon station at Indiana 67 and County Road 100 South in Madison County Ind. after heavy rain on Thursday, July 6, 2017. Several roads were covered by high water in Union Township after 3 inches of rain fell in the area around Chesterfield Ind. according to the Madison County Emergency Management Agency. (Don Knight/The Herald-Bulletin via AP)

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In this Wednesday, June 21, 2017, photo provided by Alaska SeaLife Center shows a walrus pup in a quarantined pen as it's cared for at the Alaska SeaLife Center, in Seward, Alaska. The pup was found on a mining barge in Nome, Alaska, and transported to the SeaLife Center, which is the only facility in Alaska that holds permits to care for stranded marine mammals. Center officials estimate the pup was two weeks old when it was found. (Jennifer Gibbins/Alaska SeaLife Center via AP)

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Storm damage at Lake Forest Cemetery in Grand Haven on Friday, July 7, 2017. (Cory Morse /The Grand Rapids Press via AP)

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Storm damage at Lake Forest Cemetery in Grand Haven on Friday, July 7, 2017. (Cory Morse /The Grand Rapids Press via AP)

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Travelers walk to a train in the New Jersey Transit portion of New York's Pennsylvania Station, Friday, July 7, 2017. New Jersey Transit says trains are operating on or close to schedule after one of its trains was involved in a "minor," slow-speed derailment at Penn Station, the nation's busiest train station. (AP Photo/Richard Drew)

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Commuters arrive in the New Jersey Transit portion of New York's Pennsylvania Station, Friday, July 7, 2017. New Jersey Transit says trains are operating on or close to schedule after one of its trains was involved in a "minor," slow-speed derailment at Penn Station, the nation's busiest train station. (AP Photo/Richard Drew)

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Commuters arrive in the New Jersey Transit portion of New York's Pennsylvania Station, Friday, July 7, 2017. New Jersey Transit says trains are operating on or close to schedule after one of its trains was involved in a "minor," slow-speed derailment at Penn Station, the nation's busiest train station. (AP Photo/Richard Drew)

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Commuters arrive in the New Jersey Transit portion of New York's Pennsylvania Station, Friday, July 7, 2017. New Jersey Transit says trains are operating on or close to schedule after one of its trains was involved in a "minor," slow-speed derailment at Penn Station, the nation's busiest train station. (AP Photo/Richard Drew)

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FILE - In this Oct. 1, 2016, file photo, rhinos graze in the bush on the edge of Kruger National Park in South Africa. A spokesman for South African National Parks told the AP on July 3, 2017, that a story claiming four rhinos killed five poachers at the park was a hoax. (AP Photo/Denis Farrell, File)

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Demonstrators turn waste bins on the first day of the G-20 summit in Hamburg, northern Germany, Friday, July 7, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Matthias Schrader)

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Demonstrators turn waste bins on the first day of the G-20 summit in Hamburg, northern Germany, Friday, July 7, 2017. The leaders of the group of 20 meet July 7 and 8. (AP Photo/Matthias Schrader)