Environment

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Republican vice presidential candidate Paul Ryan speaks Oct. 10, 2012, to reporters outside Old Farmers Creamery in St. Petersburg, Fla. (Associated Press)

A container ship from China is docked at Massport's Conley Terminal in Boston on Friday, July 13, 2012. The U.S. trade deficit widened in August as exports fell to the lowest level in six months, a worrisome sign that a slowing global economy is cutting into demand for U.S. goods (AP Photo/Stephan Savoia)

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On Wednesday, Dec. 28, 2011, Mexican marines stand guard over barrels containing 120,000 kilograms (264,000 pounds) of methylamine, a precursor chemical for manufacturing meth, seized at the Pacific port of Lazaro Cardenas, Mexico, that were headed for Guatemala. The meth problem is spilling into other parts of Latin America, too, almost all of it bound for Guatemala. (AP Photo/SEMAR)

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An Israeli army helicopter lands in an open area as soldiers search for the remains of a drone in the Negev in southern Israel on Saturday, Oct. 6, 2012. (AP Photo/Yehuda Lachiani)

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Roger Federer returns the ball against Stanislas Wawrinka during the third round of the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, on Oct. 11, 2012. Federer won 4-6 7-6(4), 6-0. (Associated Press)

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A five-story parking garage is shown after it collapsed at Miami-Dade College, Wednesday, Oct. 10, 2012, in Doral, Fla., killing one worker and trapping two others in the rubble, officials said. Several other workers were hurt, including one rescued from the debris. (AP Photo/Lynne Sladky)