Environment

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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.

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The Avery model features a center-island kitchen with granite counters and stainless steel appliances.

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Van Metre Homes is building 14 homes from its Marquis Custom Estate Collection on sites of 3 to 8 acres at Fox Knoll of Middleburg. The Avery model is base-priced from $729,990.

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As planes take off from Ronald Reagan Washington National Airport, lawmakers on nearby Capitol Hill are arguing for an Article 84 court challenge against EU fees for carbon emissions. (Associated Press)

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Duke guard Austin Rivers is just the fourth player to leave for the NBA after one season in Mike Krzyzewski's 32 seasons at the Durham, N.C., school. Rivers' father, Doc Rivers, coaches the Boston Celtics. (Associated Press)

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This map, released by the Federal Emergency Management Agency, shows the likely effects from a 10-kiloton nuclear device set off a few blocks north of the White House. (AP Photo/FEMA)

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Delta Brogden pumps gas at a station in Atlanta earlier this month. The nationwide average for a gallon of gas reached $3.90 on Monday, which is now less than 10 cents away from last year's high. (Associated Press)

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**FILE** Henry Rice, of Atlanta, pumps gas March 16, 2012, at a station in Atlanta. (Associated Press)

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This map, released by the Federal Emergency Management Agency, is contained in a report from a study that analyzed the likely effects from terrorists setting off a 10-kiloton nuclear device a few blocks north of the White House. The map shows a summary of severe, moderate and light damage zones, and types of damage or injuries likely to be encountered by responders. (AP Photo/FEMA)

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Maryland Gov. Martin O'Malley is pushing for an offshore wind energy bill after a similar measure failed last year because of bipartisan concerns over the likelihood that its implementation would drive up energy prices. (Rod Lamkey Jr./The Washington Times)

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The Deepsea Challenger submersible with James Cameron inside is moved into place to begin its descent 7 miles below the surface of the Pacific Ocean to the Mariana Trench. The movie director spent more than three hours inside the trench. (National Geographic via Associated Press)

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An oil container, a bucket and a bag of trash litter a gully near Highway 85, a key route for truckers in North Dakota's oil country. Some of the industrial rubbish blows from unsecured truckloads, but the most frustrating trash is discarded urine. (Associated Press)

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A commercial billboard welcoming Pope Benedict XVI stands near Bicentennial Park. (AP Photo/Gregorio Borgia)

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**FILE** Tugboats pull the crippled tanker Exxon Valdez towards Naked Island in Prince William Sound, Alaska, on April 5, 1989, after the ship was pulled from Bligh Reef. (Associated Press)

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EYA is building 112 town homes at the Townhomes at Mosaic District in Fairfax. The homes have 1,848 to 2,566 finished square feet, with base prices from $597,400 to the $800,000s.

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** FILE ** In this Oct. 14, 2011, file photo, Mike and Chantell Sackett of Priest Lake, Idaho, pose for a photo in front of the Supreme Court in Washington. The Supreme Court ruled unanimously Wednesday that property owners have a right to prompt review by a judge of an important tool used by the Environmental Protection Agency to address water pollution. (AP Photo/Haraz N. Ghanbari, File)