Environment

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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)

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Russian space officials watch video footage of researchers in space suits simulating a landing on Mars at the Mission Control Center in Korolyov, just outside Moscow, Monday, Feb. 14, 2011. The international crew of researchers conducted a mock landing on Mars after 257 days of confinement in an isolated module to imitate a flight to the Red Planet. (AP Photo/Sergey Ponomarev)

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Russian space officials watch video footage of researchers in space suits simulating a landing on Mars at the Mission Control Center in Korolyov, just outside Moscow, Monday, Feb. 14, 2011. After 257 days in a locked steel capsule, researchers on a mock trip to Mars ventured from their cramped quarters Monday in heavy space suits, trudging into a sand-covered room to plant flags on a simulated Red Planet. The crew of three Russians, a Frenchman, an Italian-Colombian and a Chinese entered a network of modules at a Moscow research center last June to imitate the 520-day flight and see how they handle the constricted, isolating conditions of space travel _ minus the weightlessness. (AP Photo/Sergey Ponomarev)

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This photo released by NASA/JPL on Feb. 15, 2011 shows an image from NASA's Stardust mission of comet Tempel 1 taken on Feb. 14, 2011. The Stardust craft zipped past a comet half the size of Manhattan during a Valentine's Day rendezvous that scientists hoped would shed light on these icy solar system bodies. At nearest approach, the craft passed within 112 miles of the potato-shaped comet, closer than the original prediction. (AP Photo/ NASA/JPL/ Caltech/Cornell)

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A woman holds a child as they stand outside a building as a precaution after a magnitude-6.8 earthquake in Concepcion, Chile, Friday Feb. 11, 2011. The earthquake struck central Chile Friday, centered in almost exactly the same spot where last year's magnitude-8.8 quake spawned a tsunami and devastated coastal communities. Electricity and phone service were disrupted and thousands of people fled to higher ground following Friday's quake, but the government quickly announced that there was no risk of a tsunami, and there were no reports of damage or injuries. (AP Photo/Francisco Negroni)