Environment

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Members of the Swift Water Rescue Team rescue stranded employees of radio station WQRZ in the Shoreline Park area of Bay St. Louis, Miss., during Hurricane Isaac on Wednesday, Aug. 29, 2012. (AP Photo/Sun Herald, John Fitzhugh)

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Then-Alaska governor Sarah Palin was introduced to America four years ago when Sen. John McCain of Arizona announced her as his Vice Presidential running mate. (Associated Press)

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A wave breaks along a bridge off the southern port city of Busan, South Korea, as Typhoon Bolaven brings heavy rain and wind. The typhoon killed nine, caused cancellation of joint U.S.-South Korean military exercises and cut off power to 1.7 million homes and businesses. (Associated Press)

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Senior hurricane specialist Stacy Stewart tracks Isaac at the National Hurricane Center in Miami, Tuesday, Aug. 28, 2012. Forecasters at the National Hurricane Center warned that Isaac, especially if it strikes at high tide, could cause storm surges of up to 12 feet (3.6 meters) along the coasts of southeast Louisiana and Mississippi and up to 6 feet (1.8 meters) as far away as the Florida Panhandle. (AP Photo/Alan Diaz)

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A Chinese fisherman (center) is rescued Aug. 28, 2012, by South Korean coast guard officers from a Chinese ship in Jeju, South Korea, after a powerful typhoon pounded the nation with strong winds and heavy rain. The coast guard battled rough seas in a race to rescue fishermen on two Chinese ships that slammed into rocks off the southern coast. (Associated Press)

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A National Oceanic and Atmospheric Administration satellite image taken on Tuesday, Aug. 28, 2012, at 1:45 a.m. EDT shows a swirl of clouds in the Gulf of Mexico associated with Tropical Storm Isaac as it moves slowly toward the central Gulf Coast. Landfall is expected later Tuesday or early Wednesday in Louisiana. (AP Photo/Weather Underground)

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A line of traffic extends down Airline Highway as residents leave the New Orleans area in anticipation of Tropical Storm Isaac, in Kenner, La., on Monday. Isaac was expected to make landfall on the Louisiana coast as a hurricane. (Associated Press)

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The El Sol Market in Brawley, Calif., was hit hard by an earthquake swarm on Sunday, Aug. 26, 2012. (AP Photo/Imperial Valley Press, Brandy Ronek)

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A policeman looks at a burned double-decker sleeper bus on Aug. 26, 2012, after it collided with a tanker loaded with highly-flammable methanol on an expressway in Yan'an in northwest China's Shaanxi province, causing both vehicles to burst into flames and killing 36 people, state media said. (Associated Press)

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A family walks on a street as flames rise in the distance from an explosion at the Amuay refinery near Punto Fijo, Venezuela. Residents near the country’s biggest oil refinery said they smelled a strong odor of sulfur hours before a gas leak led to an explosion on Saturday. The fire was still burning on Sunday (below). The blast damaged 209 homes and 11 businesses. (Associated Press)