Environment
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In this Dec. 2010 photo provided by the Florida Fish and Wildlife Conservation Commission, a North Atlantic right whale is seen entangled in rope off the coast of Daytona Beach, Fla. Researchers succeeded this month in using sedatives fired from a dart gun to calm down and free an endangered North Atlantic right whale tangled in fishing line. (AP Photo/Florida Fish and Wildlife Conservation Commission)

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National Highway Traffic Safety Administrator Davis Strickland makes a statement as U.S. Transportation Secretary Ray LaHood looks on during a news conference announcing the new Driver Alcohol Detection System for Safety (DADSS) in Waltham, Mass., Friday morning, Jan. 28, 2011. (AP Photo/Stephan Savoia)

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FILE - In this Sept. 11, 2005 file photo, the Louisiana Superdome sits in the foreground as floodwaters from Hurricane Katrina continue to recede in New Orleans. The 36-year-old Louisiana Superdome is getting its biggest overhaul since Hurricane Katrina tore away a lot of the roof and flooded the arena with millions of gallons of water. (AP Photo/David J. Phillip, Pool, File)

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FILE - In a May 5, 2010 file photo, Dusty Chauvin watches as the Mariah Jade passes through a patch of oil dispersant off the coast of Louisiana in the Gulf of Mexico. The most extensive study to gauge the effectiveness of chemical dispersants used deep in the ocean on the BP oil spill found mixed results. It appeared to keep some oil from bubbling up to the surface where it could do worse damage, but it didn't appear to biodegrade the oil quite as fast as promised. (AP Photo/The Houma Courier, Matt Stamey, File)

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Pigs enjoy relatively clean pens at the Little Donkey Farm, which claims to use no chemicals of any kind to raise or treat the pigs. Clenbuterol, known in China simply as "lean meat powder," is a dangerous drug that's banned in China's food supply. (Associated Press)

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The home at 5802 Chain Bridge Forest Court in McLean is on the market for $1,069,000. The five-bedroom, three-bath home was built in 1972. It is at the end of a cul-de-sac with three other homes.

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Pulte Homes is building 241 town homes and 57 single-family homes on 6,500- to 7,500-square-foot sites at East Gate in Chantilly. The town homes have 2,049 to 2,711 finished square feet, with base prices from $338,990 to $412,900.

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The Crest at Columbia Heights condominium has nine homes on four floors. The homes are priced from the $200,000s to the $500,000s, with average monthly condominium fees of $287.

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The Belmont model at Stoney Springs has a two-story family room with a fireplace, a breakfast area and center-island kitchen across the back of the home. It has 3,793 square feet and is priced from $715,900.

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Winchester Homes is building 98 single-family homes on half-acre sites at Stoney Springs in Poolesville. The homes have 2,833 to 5,139 finished square feet, with base prices from $509,900 to $804,900.

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The president tours Orion Energy Systems, which makes high-efficiency lighting and renewable solar technology for businesses, in Manitowoc, Wis., on Wednesday. He is joined by Orion founder and CEO Neal Verfuerth. (Associated Press)

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President Barack Obama receives an autographed Green Bay Packers Charles Woodson from Wisconsin Gov. Scott Walker, center, and Green Bay Mayor Jim Schmitt, upon his arrival in Green Bay, Wis., Wednesday, Jan. 26, 2011, en route to nearby Manitowoc, Wis., where he will a tour renewable-energy factories and talk about jobs and the economy. Obama, a Chicago native, predicted the Chicago Bears would beat Green Bay in the NFC Championship game. (AP Photo/J. Scott Applewhite)

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Lilane Estine rests as her three sons are treated at the Doctors Without Borders (MSF) cholera clinic in Saint-Marc, Haiti, Saturday Jan. 22, 2011. The cholera epidemic that killed nearly 4,000 people, is claiming fewer victims, with a sharp drop in new cases everywhere from the Artibonite Valley to the crowded urban slums. (AP Photo/Rodrigo Abd)

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Farmers clean rice fields covered in muddy water believed to be contaminated by the cholera bacteria in Saint-Marc, Haiti, Saturday Jan. 22, 2011. The cholera epidemic that killed nearly 4,000 people, is claiming fewer victims, with a sharp drop in new cases everywhere from the Artibonite Valley to the crowded urban slums. (AP Photo/Rodrigo Abd)

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A woman suffering cholera symptoms is carried to a local hospital in Limbe village near Cap Haitien, Haiti, in November. In 2010, crisis piled upon crisis in Haiti. More than 230,000 are believed to have died in the quake, and more than a million remain homeless. A cholera epidemic broke out in the fall, and a dysfunctional election was held, its results still unclear. (Associated Press)

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A rice farmer eats his lunch while sitting in a field covered in muddy water thought to be contaminated by the cholera bacteria in Saint-Marc, Haiti, on Saturday. The cholera epidemic that killed nearly 4,000 people is claiming fewer victims with a sharp drop in new cases everywhere from the Artibonite Valley to the crowded urban slums. (Associated Press)

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** FILE ** Toyota Motor Corp. President Akio Toyoda introduces the Prius V midsize hybrid-electric vehicle at the North American International Auto Show in Detroit on Jan. 10, 2011. (AP Photo/Paul Sancya)

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Laura Brenner shares a laugh with her adopted daughter, Ketia, 9, at their home in Seattle. Ketia was one of 54 children rescued from the horrific aftermath of the Jan. 12 earthquake last year in Haiti. (Associated Press)

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Kansas Gov. elect Sam Brownback names former House speaker Robin Jennison to lead the Department of Wildlife and Parks during a news conference in Wichita, Kan. on Friday, Jan. 7, 2011. (AP Photo/ The Wichita Eagle, Mike Hutmacher)

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Venus Williams of the U.S. reacts during a press conference after she withdrew from her third round match against Germany's Andrea Petkovic injured at the Australian Open tennis championships in Melbourne, Australia, on Friday, Jan. 21, 2011. (AP Photo/Andrew Brownbill)