Environment

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** FILE ** An AV-8B Harrier jet, piloted by U.S. Marine Capt. Andrew D'Ambrogi of Marine Attack Squadron 211, comes in for a landing at Auxiliary Airfield II, a simulated amphibious assault ship flight deck, on the Barry M. Goldwater Range in Yuma, Ariz., on Sept. 12, 2008. (AP Photo/U.S. Marine Corps, Cpl. T.M. Stewman)

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People hug trees at the Hoyt Arboretum in Portland, Ore., on Saturday, July 20, 2013, as part of an attempt to break the Guinness world record for the most people hugging trees simultaneously. (AP Photo/The Oregonian, Brittany Greeson)

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Emissions pour from The Corus steel plant in the Netherlands. The European Union’s cap-and-trade emissions trading scheme, while more affordable than the carbon tax, has run into problems of its own, as the early “market” for polluting rights proved badly out of whack, sending designers back to the drawing board. (Associated Press)

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**FILE** Conor Doyle celebrates after scoring for the U.S. during an U-20 CONCACAF Championship soccer game against Guatemala in Guatemala City, Wednesday, April 6, 2011. (AP Photo/Moises Castillo)

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An air tanker makes a drop on the Mountain Fire near Lake Hemet, Calif., on Tuesday, July 16, 2013. The 14,200 acre forest fire near Idyllwild Calif., has caused Idyllwild and adjacent communities east of Highway 243 to issued mandatory evacuations for hundreds of homes Wednesday. (AP Photo/The Press-Enterprise, Frank Bellino)

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A leatherback turtle heads back to the ocean after burying her eggs in the sand at daybreak on a narrow strip of beach in Grande Riviere, Trinidad. (Associated Press)

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The U.S. Marine Corps band celebrates its 215th birthday this week. It is proud of its nickname, "The President's Own." (United States Marine Band)

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Burned-out railroad tanker cars and the smouldering remains of businesses in downtown of Lac-Megantic, Quebec, are seen on Sunday, July 7, 2013. A runaway train on Saturday derailed, igniting explosions and fires that destroyed the town's business district. (AP Photo/The Canadian Press, Paul Chiasson)

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The Washington Monument was previously encased in scaffolding in 1999 during a restoration that helped prevent further damage when an earthquake hit the region in August 2011, necessitating the current repairs. (Associated Press)