Environment

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Cars drive under a grid of power lines crossing the 5 Highway Friday, March 27, 1998, in Los Angeles. California will try a second time to launch a deregulated, $23 billion electricity market designed to lower rates and improve efficiency through competition. (AP Photo/Damian Dovarganes)

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** FILE ** This satellite image provided by DigitalGlobe and collected on Thursday, May 14, 2009, shows the area in which North Korea reportedly conducted an underground nuclear test on Monday, May 25, 2009, located about 50 miles northwest of the northern city of Kilju, North Korea, Russian Defense Ministry spokesman Alexander Drobyshevsky said on state-run Rossiya television. (AP Photo/DigitalGlobe)

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**FILE** President Barack Obama makes a statement at the United Nations Climate Change Conference at the Bella Center in Copenhagen, Denmark, on Dec. 18, 2009. (Associated Press)

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Activists dressed as polar bears stage a protest at the U.N. Climate Summit in Copenhagen on Monday, Dec. 14, 2009, on behalf of humans who are being hit hard by climate change. (AP Photo/Heribert Proepper)

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** FILE ** The sun rises behind the construction site of a housing project among the haze clouding the skyline of Shenyang, China, Sunday, Dec. 6, 2009. (Associated Press)

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The first of three KLM passenger planes headed toward New York takes off from Schiphol airport in Amsterdam, Netherlands, Monday April 19, 2010. European transport officials have carved up the sky, creating three zones to break the flight deadlock caused by a cloud of volcanic ash flowing from Iceland over Europe. France said Monday that European countries can resume airline traffic in designated "caution zones" where the threat of ash is considered less dangerous. (AP Photo/Peter Dejong)

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**FILE** Afghan farmers work in an opium poppy field in Nawa district of Helmand province, south of Kabul, Afghanistan, on April 25, 2009. (Associated Press)

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**FILE** Greek Finance Minister George Papaconstantinou talks to the media during a press conference on May 2, 2010, in Athens. (Associated Press)

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South Koreans watch a television screen showing undated file footage of a South Korean Navy ship near the disputed waters off South Korea's west coast, at a railway station in Seoul on Tuesday, Nov. 10, 2009. The two Koreas briefly exchanged naval fire Tuesday along their disputed western sea border, with a North Korean ship suffering heavy damage before retreating, South Korean military officials said. (AP Photo/Ahn Young-joon)

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The dashboard on the new Sonata Hybrid displays not only gas levels, but economy and electric motor information at the New York International Auto Show in New York, Thursday, April 1, 2010. The Obama administration set tougher gas mileage standards for new cars and trucks Thursday, April 1, spurring the next generation of fuel-sipping gas-electric hybrids, efficient engines and electric cars. (AP Photo/Seth Wenig)

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** FILE ** The Total Port Arthur refinery is shown Wednesday, Dec. 2, 2009, in Port Arthur, Texas. Over the past several years, Total Petrochemical's sprawling oil refinery in southeast Texas has sprayed tons of sulfuric acid and carbon monoxide into the sky. The French company's 62-year-old facility has also released cancer-causing benzene, regularly surpassed allowable pollution limits, failed to report dozens of emissions and how much. Total is the most heavily fined polluter in Texas in the 2009 fiscal year, according to the year-end report summarizing how companies were punished in the state that produces the most industrial pollution. (AP Photo/David J. Phillip)

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In this June 5, 2009, photo, workers give the final checkup to new Prius hybrid vehicles at Toyota's Tsutsumi Plant in Toyota, Japan. (AP Photo/Shizuo Kambayashi, File)

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People celebrate Mass under a tent next to an earthquake destroyed home in Port-au-Prince, Sunday, March 21, 2010. A 7.0-magnitude earthquake hit Haiti on Jan. 12, killing and injuring thousands and leaving more than a million people living in makeshift camps. (AP Photo/Ramon Espinosa)

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Two U.S. Marines fill out research consent forms before taking psychological tests at the Marine Corps Air Ground Combat Center in Twentynine Palms, Calif., on Sept. 29, 2009. The U.S. government is testing hundreds of Marines and soldiers before they ship out, in search of clues that might help predict who is most susceptible to post-traumatic stress disorder. (Associated Press) ** FILE **

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This file photo shows South Korea lifting the remaining half of the Cheonan from the Yellow Sea waters off Baengnyeong Island in April 2010. On March 26, 2010, the naval warship sank after a mysterious explosion that left 46 sailors dead. On July 9, 2010, investigators from South Korea, the U.S., Britain, Australia, Canada and Sweden concluded that it was struck by a torpedo of North Korean origin. (Yonhap via Associated Press)

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**FILE** A container for birth-control pills designed to look like a woman's compact is displayed. (Associated Press)

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Firefighters try to extinguish burning cars near to the Hadrian's Arch seen in the background, in Athens, Wednesday, May 5, 2010. Greek fire officials say three people have died in a blaze at an Athens bank during rioting over government austerity measures. An estimated 100,000 people took to the streets Wednesday during a nationwide wave of strikes against spending cuts aimed at saving the country from bankruptcy. (AP Photo/Thanassis Stavrakis)