Environment

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U.S. Army UH-60 Black Hawk helicopters arrive to pick up soldiers during an exercise at Fort Campbell, Ky., for Week of the Eagles. (Image: U.S. Army) ** FILE **

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Framed by flowers and a whimsical metal sculpture, prices for all grades of self-service gasoline climb close to the $5 mark at a gas station in the Brentwood area of Los Angeles on Friday. (Associated Press)

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associated press Jamaica’s Usain Bolt finished 6 for 6 in Olympic finals, with victories in the 100 meters, 200 meters and 400-meter relay in each the London and Beijing Games. In the process, he became the first to win the 200 meters twice.

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Residents spend the night outside their homes after an earthquake in Varzaqan, Iran, on Saturday, Aug. 11, 2012. (AP Photo/Mehr News Agency, Ali Hamed Haghdoust)

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Tiger Woods chips to the 16th green during the second round of the PGA Championship golf tournament on the Ocean Course of the Kiawah Island Golf Resort in Kiawah Island, S.C., Friday, Aug. 10, 2012. (AP Photo/Evan Vucci)

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This photo from Aug. 1, 2012, shows a drought damaged ear of corn in a Westfield, Ind., cornfield. U.S. corn growers could have their worst crop in a generation as the harshest drought in decades takes its toll, the government reported Aug. 10, 2012, as it forecast the lowest average yield in 17 years. (Associated Press)