Environment

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The Duke model at the Woodlands at St. Georges in Bear, Del., has 3,700 square feet and is priced from $498,995. Buyers of this model can choose from four facades.

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The unmanned Japanese fishing vessel Ryou-un Maru dirfts northwest in the Gulf of Alaska approximately 164 miles southwest of Alaska's Baranof Island on Wednesday, April 4, 2012. (AP Photo/U.S. Coast Guard Petty Officer 1st Class Sara Francis)

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In the U.S., the Obama administration has been a big advocate for solar energy, with Mr. Obama recently touring and speaking at Sempra's Copper Mountain Solar 1 facility in Boulder City, Nev. (Associated Press)

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** FILE ** In this April 4, 2012, file photo, President Obama listens to Jeffrey Martin, the chief executive officer of Sempra U.S. Gas Power, during a tour at the Copper Mountain Solar 1 facility in Boulder City, Nev. John Sowers and Kevin Gillespie also join the tour. (Associated Press)

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Even before cable news outlets began reporting the tornadoes that ripped through Texas on Tuesday, a map of the state began blinking red on a screen in the Red Cross' new social media monitoring center, alerting weather watchers that something was happening in the hard-hit area. (Associated Press)

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"There is development within North Korea of a road-mobile [ICBM] system that we've observed," says Adm. Robert F. Willard, U.S. Pacific Command chief. (Associated Press)

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Gasoline prices are shown at a local gas station in Miami, Wednesday, April 4, 2012. (AP Photo/Alan Diaz)

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**FILE** Gina Johnson performs leak tests on hydraulic fittings at the Eaton Corp. plant in Berea, Ohio, on Jan. 25, 2012. (Associated Press)

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This undated photo of a fossil provided by the Beijing Institute of Vertebrate Paleontology and Paleoanthropology of a new species of tyrannosaur, Y. huali, shows it had feathers on its tail. (AP Photo/Beijing Institute of Vertebrate Paleontology and Paleoanthropology, Zang Hailong)

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Some disgruntled Louisiana educators are weighing a bid to recall Louisiana Gov. Bobby Jindal, but no one in the governor's mansion is panicking. (Associated Press)

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California Gov. Jerry Brown (left), Interior Secretary Kenneth L. Salazar (right) and Uwe T. Schmidt of Solar Trust attend an event near Blythe, Calif., for the Blythe Solar Power Project in June. (Associated Press)

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** FILE ** A volunteer from the Philippine Animal Welfare Society (PAWS) pets a pit bull, one of more than 200 rescued from South Korean nationals at a coffee farm lot in San Pablo city, Laguna province, south of Manila, Philippines, on April 3, 2012. (Associated Press)

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Firefighters and Emergency Ministry officials examine the scene of a fire at a market on the outskirts of Moscow on Tuesday, April 3, 2012. The blaze killed 17 migrant workers. (AP Photo/Maxim Dmitriyev)

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A woman receives a free meal on April 1, 2012, during a soup kitchen organized by a Greek humanitarian group in Athens' main Syntagma square. (Associated Press)

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Kendall Marshall averaged 7.8 points and 9.7 assists per game for North Carolina this season. (Associated Press)

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Rigs belonging to PetroChina pump oil near the banks of a snow-covered lake in Daqing in northeastern China's Heilongjiang province. Exxon Mobil is pumping less oil than PetroChina, a company formed just 13 years ago by the Chinese government to better compete for the world's oil and natural gas. (Associated Press)

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In "Einhander," released in Japan in 1997 and North America in 1998 for PlayStation, the player must help save Earth from vicious assaults by the moon. (Photograph provided by the Smithsonian American Art Museum)

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Protesters shout slogans against the Pakistani government to condemn killings in Quetta, Pakistan, on Thursday, March 29, 2012, after an attack by a gunman who appeared to target local employees of the U.N. Food and Agriculture Organization, officials said. (AP Photo/Arshad Butt)

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Toll Bros. is building 13 town homes at Shady Grove Crossing in Derwood. The homes have 2,439 to 2,500 finished square feet, with base prices from $496,995 to $519,995. Homeowner association fees are $100 per month.