Water in the atmosphere traps heat, like glass in a greenhouse. When there's less water vapor in the atmosphere, less heat is trapped. Space Frontiers/Getty Images hide caption

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Atmospheric Dry Spell Eases Global Warming

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Methane Causes Vicious Cycle In Global Warming

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Tools like these ax heads from Vinelz, Switzerland, were used by Neolithic farmers and may have been part of their sex appeal to hunter-gatherer women. Sandstein via Wikimedia hide caption

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For Cave Women, Farmers Had Extra Sex Appeal

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Smog shrouds the Los Angeles skyline. New ozone standards from the EPA aim to reduce smog, but may actually increase global warming. David McNew/Getty Images hide caption

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New Anti-Smog Restrictions Could Warm Planet

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Haitian Quake Not A Surprise To Geologists

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Quake Toll Amplified By Geography, Lax Construction

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A large crack in the earth is seen in Port-au-Prince, Haiti, after a 7.0 magnitude earthquake Tuesday. Matt Marek/ American Red Cross via Reuters/Landov hide caption

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Breakthrough Announced In Climate Talks

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Obama: Danger Of Climate Change Grows

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Climate Conference Winding Down In Copehagen

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Answering Listeners' Questions On Climate Summit

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China Refuses To Put Climate Commitment In Writing

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Rich, Poor Nations Divided Over Reducing Emissions

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Nuclear power plants like this one in Middletown, Pa., currently supply 20 percent of the nation's electricity. Some legislators want them to provide more, but it's turning into quite a sticky subject. Carolyn Kaster/AP hide caption

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The Climate Conundrum Over Nuclear Energy

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3 Senators Strike Climate Legislation Compromise

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