Environment

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This photo released by the Bureau of Safety and Environmental Enforcement shows natural gas spewing from the Hercules 265 drilling rig in the Gulf of Mexico off the coast of Louisiana, Tuesday, July 23, 2013. (AP Photo/Bureau of Safety and Environmental Enforcement)

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This Dec. 2012 photo shows a weak and lethargic rat who was found in a tub among at least 200 other juvenile rats, many of whom were severely dehydrated and dying at a breeding center in Lake Elsinore, Calif., authorities said Monday, July 22, 2013. Riverside County authorities say two men have been charged with 106 counts of felony animal cruelty for the way they treated nearly 20,000 rats and reptiles found diseased, dying or dead. (AP Photo/PETA)

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Chinese paramilitary policemen helps residents remove belongings from quake-damaged houses in Lalu village of Hetuo township in Minxian in northwest China's Gansu province Monday July 22, 2013. (AP Photo)

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D.C. Mayor Vincent C. Gray has set a goal, branded "Sustainable D.C.," of making 100 percent of District waters fishable and swimmable by 2032, yet there is cause to question his willingness to allow DDOE to do its job. The clean rivers initiative is a belated attempt to reverse a decades long trend of stormwater runoff that leads to sewage overflow. (The Washington Times)

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** FILE ** In this photo released by Xinhua News Agency, rescuers clear the debris of a damaged house in quake-hit Majiagou Village of Minxian County, northwest China's Gansu Province, Monday, July 22, 2013. (AP Photo/Xinhua, Guo Gang)

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Detroit Mayor Dave Bing (left), with state-appointed emergency manager Kevyn Orr, said Sunday, "There are over 100 major urban cities that are having the same problems we're having. We may be one of the first. We are the largest, but we absolutely will not be the last." (Associated Press)

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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)