Environment

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Minnesota Vikings wide receiver Sidney Rice is on the Redskins' radar in free agency with a decision still to be made on whether to re-sign Santana Moss, the team's top receiver since 2005. (Associated Press)

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Santonio Holmes is reported to be the Redskins' top priority in free agency. He caught 52 passes last year for the New York Jets. (Associated Press)

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Tomb no. 1, the largest of the three pits where China's army of terracotta soldiers are buried, (Photo: AFP)

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Space shuttle Atlantis is towed to the Orbitor Processing Facility for decommissioning as hundreds of NASA employees gather at the Kennedy Space Center at Cape Canaveral, Fla., on Thursday, July 21, 2011. The landing of the spacecraft marks the end of NASA's 30-year shuttle program. (AP Photo/Terry Renna)

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Johnson Space Center Director Michael Coats (left) kisses his wife, Diane, after being presented with the space shuttle Atlantis' mission flag in Houston after the spacecraft landed on Thursday, July 21, 2011. The flag flew during the mission, which brought NASA's space shuttle program to an end. (AP Photo/David J. Phillip)

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Space shuttle Atlantis lands at the Kennedy Space Center at Cape Canaveral, Fla., on Thursday, July 21, 2011. The landing of the spacecraft marks the end of NASA's 30-year shuttle program. (AP Photo/Pierre Du Charme, Pool)

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Space shuttle Atlantis lands at the Kennedy Space Center at Cape Canaveral, Fla., on Thursday, July 21, 2011. The landing of shuttle marks the end of NASA's 30-year space shuttle program. (AP Photo/James Nielsen, Houston Chronicle )

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Somali women displaced by drought wait to receive rations at a camp in Mogadishu, Somalia, on July 20. Southern parts of Somalia are experiencing famine, a U.N. official said Wednesday, and tens of thousands of Somalis have already died in the worst hunger emergency in a generation. (Associated Press)

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Mayor Vincent C. Gray said Wednesday that the city's zoning commission approved an emergency proposal for the city's sole federal firearms licensee. (Pratik Shah/The Washington Times)

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ASSOCIATED PRESS This image provided by NASA shows a view of Space Shuttle Atlantis while still docked with the International Space Station taken by crew member Mike Fossum aboard the station Monday. The robotic arm on the shuttle appears to be saluting "goodbye." Earth's airglow is seen as a thin line above Earth's horizon.

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U.S. CUSTOMS AND BORDER PROTECTION A still from a U.S. Customs and Border Protection ad called “Birdcage” that asks the public's help in stopping “modern-day slavery.” It will be aired in the District, Florida, North Carolina and Georgia.

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With a new law in place starting July 1, 2011, Elk Run Vineyards is now able to ship wines within the state of Maryland, which has helped their business, says Winemaker and General Manager Fred Wilson. (Drew Angerer/The Washington Times)

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Emergency crews work to save a mother and her four children after the family was pulled from a burning house in Medford, Ore., on Monday, July 18, 2011. Authorities believe the five, all of whom died, were stabbed and suffered smoke inhalation. (AP Photo/Mail Tribune, Bob Pennell)

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The space shuttle Atlantis, with the Earth behind it, still is docked to the International Space Station early on Tuesday, July 18, 2011, in this image made from NASA TV. (AP Photo/NASA)

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The space shuttle Atlantis passes under a solar panel on the International Space Station after undocking on Tuesday, July 19, 2011. (AP Photo/NASA)

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Sen. Tom Coburn, Oklahoma Republican, offers his "Back in Black" plan to reduce the federal deficit during a news conference Monday. It attempts to explain how to reduce the deficit by more than $900 billion during the next 10 years. (Associated Press)

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This panoramic view provided by NASA was photographed from the International Space Station, looking toward Earth past the cargo bay of the docked space shuttle Atlantis and part of the station, including a solar array panel, on Thursday, July 14, 2011, as the complex passed over the Southern Hemisphere. The Aurora Australis, or Southern Lights, can be seen on Earth's horizon, and a number of stars also are visible. (AP Photo/NASA)