Environment

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Power-line towers in South Africa belong to Eskom, which is Africa's biggest power utility. It accounts for more than 60 percent of all the electricity generated on the continent, according to the World Bank. It also exports across southern Africa. Critics and even supporters say Eskom should have started its move toward renewable sources of energy earlier, and now needs to set its ambitions higher. (AP Photo/Denis Farrell)

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South Africa's Koeberg nuclear power station (left) is located on the outskirts of Cape Town. The country's plans to increase it's nuclear reactor capacity are drawing attention from energy companies around the world. Power-line towers in South Africa belong to Eskom, which is the state electricity utility. The company accounts for more than 60 percent of all the electricity generated on the African continent, according to the World Bank. (Associated Press)

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South African Energy Minister Dipuo Peters (left), here with former South African President Thabo Mbeki (center) in 2005, says new nuclear technology is safe. (Associated Press)

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Former Massachusetts Gov. Mitt Romney, the presumptive GOP presidential nominee, speaks at a campaign stop at KP Kauffman Co., an oil and gas production and drilling company, in Fort Lupton, Colo., on Wednesday, May 9, 2012. (AP Photo/Jae C. Hong)

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A U.S. Customs and Border Protection agent (standing) monitors a Predator B unmanned aircraft at the Naval Air Station in Corpus Christi, Texas. The agency is expanding its use of drone aircraft outfitted with powerful infrared cameras and sensitive radar to patrol U.S. borders. (Associated Press)

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This March, 2012 photo provided by SolTribe shows Joe Shark, 29, a resident of the Pine Ridge Indian Reservation, cuts a tree infested with mountain pine beetles in South Dakota's Custer State Park as part of the Lakota Logging Project. The pine beetle epidemic has grown so large that Native Americans _ historically opposed to the logging industry _ are beginning to become loggers themselves for the greater good of saving the non-infected trees and putting the marred dead ones to use. (AP Photo/SolTribe, Struever McConnell)

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Participants gather at a rally protesting against the usage of nuclear energy in Tokyo Saturday, May 5, 2012. (AP Photo/Itsuo Inouye)

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The Titanoboa exhibit at the Smithsonian Museum of Natural History features video interviews about the discovery of fossils of the largest snake species known to have existed on the planet (which researchers are comparing to finding Tyranosaurus Rex), as well as illustrations.

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The two-level homes feature hardwood flooring, oak stairs, recessed lighting and custom-designed crown molding.

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Van Metre Homes is building 53 single-family homes at Marrwood at Stone Ridge in Aldie. The Prescott model, with 3,627 square feet, is priced from $629,990.

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Residents try to extinguish fires in the smoldering remains of a market in Rubkona near Bentiu in South Sudan after an attack by Sudanese aircraft on April 23. A massive humanitarian crisis, triggered by the conflict and heightened by an approaching rainy season, is threatening the lives of hundreds of thousands of people along the Sudan-South Sudan border. (Associated Press)