Environment
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Former Alaska Gov. Sarah Palin smiles as she is introduced during a public appearance at a Long Island Association (LIA) meeting and luncheon in Woodbury, N.Y., Thursday, Feb. 17, 2011. (AP Photo/Craig Ruttle)

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The Safe Road Trains for the Environment (SARTRE) project in Europe aims to develop a wireless system that will allow cars on a public highway or motorway to join in a platoon, or semi-autonomous "road train" of vehicles.

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The Safe Road Trains for the Environment (SARTRE) project in Europe aims to develop a wireless system that will allow cars on a public highway or motorway to join in a platoon, or semi-autonomous "road train" of vehicles.

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Former Alaska Gov. Sarah Palin smiles as she is introduced at a Long Island Association (LIA) meeting and luncheon in Woodbury, N.Y., on Thursday, Feb. 17, 2011. (AP Photo/Craig Ruttle)

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This undated handout photo provided by the journal Science shows mature Atlantic tomcod at a NOAA rearing facility in Sandy Hook, New Jersey. Most people think of evolution occurring gradually over thousands of years, but apparently no one told the Atlantic Tomcod. Over the last half-century or so the Hudson River fish has evolved to become resistant to toxic PCB that polluted the river, researchers reported Thursday. (AP Photo/Science)

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In this CD cover image released by Lost Highway Records, the latest release by Hayes Carll, "KMAG YOYO" is shown. (AP Photo/Lost Highway)

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** FILE ** Cotton grows in a field near Keo, Ark., in October 2008 before being harvested. Prices for commodities such cotton, oil, corn and wheat have soared in recent months, squeezing profit margins at many companies and forcing others to pass on the higher costs to retailers. (AP Photo/Danny Johnston, File)

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This undated handout photo provided by the journal Science shows an American Black Bear. Hibernating bears set their energy demands to low, but they don't chill out very much, according to new research. (AP Photo/Institute of Arctic Biology, University of Alaska Fairbanks)

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Providence of Brookfield Homes is offering three collections of single-family homes at Heritage Shores. They are priced from $234,990 to $387,990 and have 1,297 to 2,807 square feet.

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The Churchill Group is building three-bedroom town homes at the Vistas in Gaithersburg, ranging in price from $582,990 to $637,990 with 2,380 to 2,466 finished square feet. Each home will have two full baths and two half baths.

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Haiti's presidential candidate Michel Martelly, right, and Haitian-born singer Wyclef Jean talk after a press conference announcing Jean's support on Martelly's run for the presidency in Port-au-Prince, Haiti, Wednesday, Feb. 16, 2011. (AP Photo/Ramon Espinosa)

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FILE - In this Oct. 12, 2000 file photo, an inspector wades through the checkout aisles of a supermarket in Uckfield, south of London, as the local river burst its bank and caused the town to flood, after several days of heavy rain and a night of severe storms. Two studies in the journal Nature link global warming to extreme rainstorms and snowfalls and find these weather events are getting substantially worse. One study found that the strongest precipitation events were 7 percent wetter in the 1990s than they were in the 1950s. The other looked at costly flooding in England and Wales in the fall of 2000 and found that global warming more than doubled the likelihood of that flood occurring. Both studies used computer modeling. (AP Photo/Alastair Grant, File)

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U.S. Immigration and Customs Enforcement (ICE) Agent Jaime Zapata was mortally wounded Feb. 15 during an attack near San Luis Potosi, Mexico. (Courtesy of ICE officials)

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Vice Adm. Scott van Buskirk gives an interview to the AP on the bridge of the USS George Washington at the Yokosuka Naval Base south of Tokyo on Friday, Feb. 11, 2011. (AP Photo/Greg Baker)

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President Barack Obama steps off Marine One helicopter on the South Lawn of the White House in Washington as he returns from Baltimore, Md., Monday, Feb. 14, 2011. (AP Photo/Charles Dharapak)

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Blue jays visit a feeder at the home of Nancy Castillo and Lois Geshiwlm in Providence, N.Y. Beginning Friday, bird-watchers across the United States and Canada will be creating a snapshot of populations. (Associated Press)

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Levi jeans are made of cotton. Cotton has more than doubled in price over the past year, reaching the highest mark since the Civil War. (Associated Press)

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Mr. Aristide, at a Jan. 15 press conference in Johannesburg, South Africa, said he was ready to return to his quake-devastated country, but he did not say when or how. The former Haitian president currently lives in exile in South Africa. (Associated Press)

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Wrangler jeans soon will cost more because of the high price of cotton, which accounts for half the production cost of jeans. (AP Photo/Paul Sakuma)

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In this photo taken Friday, Feb. 11, 2011, Nancy Castillo watches birds at numerous feeding stations at her home in Providence, N.Y. Beginning on Feb. 18, she will be joining bird watchers across the United States and Canada in helping to create a snapshot of bird populations as part of the Great Backyard Bird Count. (AP Photo/Tim Roske)