Environment

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FILE - In this June 24, 2013 file photo, fire-promoting beetle-killed trees mix with live trees as a wildfire burns west of Creede, Colo. Foresters say the number of standing dead trees in Colorado is increasing steadily, threatening to make wildfires worse and to degrade vital water supplies that flow from forested mountains. The Colorado State Forest Service said Wednesday, Feb. 15, 2017 that the state has an estimated 834 million standing dead trees, up nearly 30 percent from seven years ago. (AP Photo/Gregory Bull, File)

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The Pentagon has started Phase III on development of its Tactically Exploited Reconnaissance Node (TERN).(YouTube, DARPA)

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In this Tuesday, Feb. 14, 2017 photo, a member of the Syrian Tribes Army, left, that guards the Syrian side of the berm on the north eastern border with Jordan, shakes hands with a Jordanian soldier. The Tribes Army work in coordination with the Jordanian army on security clearance for patients transported from Rukban Camp to the Jordanian territories for treatment. (AP Photo/ Raad Adayleh)

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Benjamin Lopez, 12, walks past his friends room as he helps clean up after a storm destroyed the house Tuesday, Feb. 14, 2017, in Van Vleck, Texas. Tornadoes are suspected of damaging homes and knocking out power southwest of Houston as part of a strong storm system that moved quickly across much of the state. (Michael Ciaglo/Houston Chronicle via AP)

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Diane Woodard looks into her family's home after a storm Tuesday, Feb. 14, 2017, in Van Vleck, Texas. Tornadoes are suspected of damaging homes and knocking out power southwest of Houston as part of a strong storm system that moved quickly across much of the state. (Michael Ciaglo/Houston Chronicle via AP)

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Eurelio Lopez, 8, climbs over the couch in what is left of his home after a storm damaged the home Tuesday, Feb. 14, 2017, in Van Vleck, Texas. Tornadoes are suspected of damaging homes and knocking out power southwest of Houston as part of a strong storm system that moved quickly across much of the state. (Michael Ciaglo/Houston Chronicle via AP)

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Morris Hines looks at a piece of roof that was lodged into a tree after a storm tore through his friends house Tuesday, Feb. 14, 2017, in Van Vleck, Texas. Tornadoes are suspected of damaging homes and knocking out power southwest of Houston as part of a strong storm system that moved quickly across much of the state. (Michael Ciaglo/Houston Chronicle via AP)

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A man walks past piles of debris after a strom ripped through the area Tuesday, Feb. 14, 2017, in Van Vleck, Texas. Tornadoes are suspected of damaging homes and knocking out power southwest of Houston as part of a strong storm system that moved quickly across much of the state. (Michael Ciaglo/Houston Chronicle via AP)

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Harry Hobbs, left, takes a break from cleaning up the remnants of the house he is renting from Kelvin Magnum, right, after a storm ripped it apart Tuesday, Feb. 14, 2017, in Van Vleck, Texas. Tornadoes are suspected of damaging homes and knocking out power southwest of Houston as part of a strong storm system that moved quickly across much of the state. (Michael Ciaglo/Houston Chronicle via AP)

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Faith Rugeley places an American flag in the fence next to her neighbors trailer that was destroyed when a strom came through the area Tuesday, Feb. 14, 2017, in Van Vleck, Texas. Tornadoes are suspected of damaging homes and knocking out power southwest of Houston as part of a strong storm system that moved quickly across much of the state. (Michael Ciaglo/Houston Chronicle via AP)

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Carrie Casey, left, hugs her friend, Sally Farley, after Farley's home was destroyed during a storm Tuesday, Feb. 14, 2017, in Van Vleck, Texas. Tornadoes are suspected of damaging homes and knocking out power southwest of Houston as part of a strong storm system that moved quickly across much of the state. (Michael Ciaglo/Houston Chronicle via AP)

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Eurelio Lopez, 8, left, runs into what is left of his home after storm Tuesday, Feb. 14, 2017, in Van Vleck, Texas. Tornadoes are suspected of damaging homes and knocking out power southwest of Houston as part of a strong storm system that moved quickly across much of the state. (Michael Ciaglo/Houston Chronicle via AP)

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FOR STORY: GREECE TEAM CALLED HOPE - In this Sunday, Feb. 5, 2017, Ahmad Fahim Ahmadi from Afghanistan listens music inside his container house in the western Athens' suburb of Skaramagas. Most players of Hope Refugee Football Club live in a large trailer park at Skaramagas, an industrial zone west of Athens, where freight containers are turned into shoebox-shaped homes.(AP Photo/Thanassis Stavrakis)

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FOR STORY: GREECE TEAM CALLED HOPE - In this Friday, Feb. 10, 2017, Mohammad Omar from Syria plays with his teammates at the refugee camp in the western Athens' suburb of Skaramagas. Former Greek national soccer team goalkeeper Antonis Nikopolidis, who became a national hero in 2004 during the European Cup, is heading a project to help refugees stranded in Greece regain a sense of purpose, working as a team. Most players of Hope Refugee Football Club live in a large trailer park at Skaramagas, an industrial zone west of Athens, where freight containers are turned into shoebox-shaped homes. (AP Photo/Thanassis Stavrakis)

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FOR STORY: GREECE TEAM CALLED HOPE - In this Sunday, Feb. 5, 2017, a boy plays with a plastic crate as members of the Hope leave the refugee camp in the western Athens' suburb of Skaramagas. Former Greek national soccer team goalkeeper Antonis Nikopolidis, who became a national hero in 2004 during the European Cup, is heading a project to help refugees stranded in Greece regain a sense of purpose, working as a team. Most players of Hope Refugee Football Club live in a large trailer park at Skaramagas, an industrial zone west of Athens, where freight containers are turned into shoebox-shaped homes. (AP Photo/Thanassis Stavrakis)

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A Skycrane helicopter lowers a load of rocks to fill in a hole on the Oroville Dam's emergency spillway, Tuesday, Feb. 14, 2017, in Oroville, Calif. The barrier, at the nation's tallest dam, is being repaired after authorities ordered mass evacuations for everyone living below the lake out of concerns the spillway could fail and send a 30-foot wall of water roaring downstream. (AP Photo/Rich Pedroncelli)

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The gushing waters of the Feather River, downstream from a damaged dam, draw curious onlookers Tuesday, Feb. 14, 2017, in Oroville, Calif. Workers are rushing to repair the barrier at the nation's tallest dam after authorities on Sunday ordered the evacuation for everyone living below the lake amid concerns the spillway could fail and send water roaring downstream. (AP Photo/Marcio Jose Sanchez)

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In this photo taken Oct. 7, 2009, California Department of Water Resources crews do maintenance repairs on the Oroville Dam spillway in Oroville, Calif. Six months before rushing water scoured a huge hole in a channel that drains a Northern California reservoir, state inspectors said the concrete spillway was sound. In recent years, construction crews patched cracks - including in the area where water burrowed a huge pit - and a state inspector called the repairs “sound” in his February 2015 report. (Barbara Arrigoni/The Chico Enterprise-Record via AP)

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Anaheim Ducks' goalie John Gibson, center, makes a glove save on a shot as Ducks' Shea Theodore, right defends against Minnesota Wild's Nino Niederreiter (22), of Switzerland, in the first period of an NHL hockey game, Tuesday, Feb. 14, 2017, in St. Paul, Minn. (AP Photo/Tom Olmscheid)