Environment

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Residence of an apartment house work to divert flood water from their building in Boulder, Colo., on Thursday, Sept. 12, 2013. Flash flooding in Colorado has cut off access to towns, closed the University of Colorado in Boulder and left at least three people dead. (AP Photo/Ed Andrieski)

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An offshore oil installation is seen in the Gulf of Mexico near the coast of Campeche. The nation's top two presidential candidates are debating whether to turn outward and open oil to private investors, or inward by exporting less crude and giving Mexicans subsidized gasoline. (Associated Press photographs)

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An frog is launched through the air as NASA's LADEE spacecraft lifts off from the Wallops/Mid-Atlantic Regional Spaceport in Virginia. (Image: NASA)

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An frog is launched through the air as NASA's LADEE spacecraft lifts off from the Wallops/Mid-Atlantic Regional Spaceport in Virginia. (Image: NASA)

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This artist rendering released by NASA shows NASA’s Voyager 1 spacecraft barreling through space. The space agency announced Thursday, Sept. 12, 2013, that Voyager 1 has become the first spacecraft to enter interstellar space, or the space between stars, more than three decades after launching from Earth. (AP Photo/NASA)

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** FILE ** A satellite image taken on April 30, 2012, shows the area around the Yongbyon nuclear facility in North Korea. (AP Photo/GeoEye)

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Marines with Battery N, 5th Battalion, 14th Marine Regiment, fire an M777 A2 howitzer during a series of integrated firing exercises at the Marine Corps Air Ground Combat Centter Twentynine Palms' Quakenbush Training Area April 26, 2013. (credit: U.S. Marine Corps)

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** FILE ** Marines with 3rd Marine Regiment form up in front of the pedestal to honor fallen heroes on Marine Corps Base Hawaii, June 06, 2013. (credit: U.S. Marine Corps)

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Lance Cpl. Joseph Nunez from Burbank, Calif., interacts with Viky, a U.S. Marine Corps improvised explosive device detection dog, after searching a compound while conducting counter-insurgency operations in Helmand province, Afghanistan, July 17, 2013. (credit U.S. Marine Corps)

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** FILE ** "Every public official has to use her best judgment in ensuring appropriate use of personal emails," says Environmental Protection Agency ex-chief Lisa P. Jackson. (Associated Press)