Environment

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A radio-controlled PakBot robot opens a door inside the reactor building of Unit 2 at the Fukushima Dai-ichi nuclear power plant as the robot is monitored by another Pakbot from behind during inspection of the tsunami-damaged facilities on Monday, April 18, 2011, in Okuma, Fukushima Prefecture, Japan. (AP Photo/Tokyo Electric Power Co.)

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An aerial photo shows destroyed mobile homes in the Stony Brook Mobile Home Park in Raleigh, N.C., on Sunday. A tornado ripped through the area Saturday as a line of severe storms moved across the state. (Associated Press)

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Glen Passner (front) and Craig Ownes, volunteers with N.C. Baptist Men, examine damage in Raleigh, N.C., on Sunday. A pine tree cut through the upper level of the house. (Associated Press)

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In this small-group discussion in Chicheley, England, scientists discuss how the Earth's atmosphere can be manipulated into combating global warming. Four dozen experts from around the world gathered for three days in late March to talk about "geoengineering." (Associated Press)

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"If we don't understand the implications, and we reach a crisis point and deploy geoengineering with only a modicum of information, we really will be playing Russian roulette," says Steven Hamburg, a U.S. Environmental Defense Fund scientist. (Associated Press)

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Kizuki Ishimori, 27, clears debris from his family's home in Higashi-Matsushima. After the March 11 tsunami devastated his hometown, Mr. Ishimori said he might have to move south to find work. (Christopher Johnson/Special to The Washington Times)

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Rebecca Hagelin

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** FILE ** Rescuers worked throughout the early morning hours of Sunday, April 17, 2011, at the Lucky Friday Mine in Mullen, Idaho, to clear debris from a collapsed tunnel in search of a miner missing more than a mile underground since Friday, officials said. The miner's brother, who also was working in the mine, was able to escape. (AP Photo/Young Kwak, File)

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Tokyo Electric Power Co. (Tepco) Chairman Tsunehisa Katsumata bows at the end of a news conference at the company's headquarters in Tokyo on Sunday, April 17, 2011. Tepco, the operator of the crippled nuclear power plant leaking radiation in northern Japan, announced a plan that would bring the crisis under control within six to nine months and allow some evacuated residents to return to their homes. (AP Photo/Shuji Kajiyama)

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Patrick Woods, a freshman at Pine Forest High School in Fayetteville, N.C., picks up an American flag from the remains of structures on the softball field at the school on Saturday, April 16, 2011. (AP Photo/The Fayetteville Observer, Michael Conti)

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A car drives through a partially flooded street, Friday, April 15, 2011, in Decatur, Ala. Waves of strong storms left damage across a wide area of Alabama on Friday, slamming into homes and businesses and forcing promoters to cancel the first race of a busy weekend at the Talladega Superspeedway. (AP Photo/The Decatur Daily, John Godbey)

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In this letter, Virginia Gov. Robert F. McDonnell announces his veto of the state's redistricting plan.

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Angry residents forced from their homes near Japan's tsunami-stricken Fukushima Dai-ichi nuclear power plant take a seat as they meet officials of Tokyo Electric Power Co., the plant's operator, at its headquarters in Tokyo Wednesday, April 13, 2011. (AP Photo/Yuri Kageyama)

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A statue of Buddha is seen in the city cemetery in the area devastated by the Match 11 earthquake and tsunami in the town of Rikuzentakata, Iwate Prefecture, Japan, on April 14, 2011. (Associated Press)

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Jennifer Olonia refuses to leave the area near the bloated Des Lacs River in Burlington, N.D., despite warnings that a dam is in danger of breaching from floodwaters." She and her husband are "doing what we got to do," she said Thursday. (Associated Press)

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When Missouri voters approved a law in November to regulate the state's lucrative dog-breeding industry, breeders — such as Hubert Lavy, who runs Tenderheart Kennels in Silex, Mo. — argued that it would devastate their businesses. With lawmakers poised to repeal many of the restrictions, animal advocates pledge to get it back on the ballot next year. (Associated Press)