Love your hair. Artists' depictions of a Neanderthal man and woman at the Neanderthal Museum in Mettmann, Germany. Martin Meissner/AP hide caption

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Neanderthal Genes Live On In Our Hair And Skin
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Each year, 6 to 8 percent of the global population of sharks and rays gets caught, scientists say. The fish can't reproduce fast enough to keep pace Mike Johnston/Flickr hide caption

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Ancient And Vulnerable: 25 Percent Of Sharks And Rays Risk Extinction
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An Old Tree Doesn't Get Taller, But Bulks Up Like A Bodybuilder
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A sperm whale entangled in a drift net. A report says commercial fisheries around the world kill or injure 650,000 mammals a year. Alberto Romero/Marine Photobank hide caption

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Whales, Dolphins Are Collateral Damage In Our Taste For Seafood
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Arctic Methane Bubbles Not As Foreboding As Once Feared
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Move Over Electric Car, Auto Companies To Make Hydrogen Vehicles
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Workers in Oakland, Calif., check the damage to Interstate 880 on Oct. 19, 1989; this portion of the freeway had collapsed during the Loma Prieta earthquake two days earlier. Paul Sakuma/AP hide caption

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West Coast's Early Warning System For Quakes Still Spotty
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Strong gusts in Palm Springs, Calif., generate plenty of energy, thanks to turbine farms. But being able to store all of that energy is just as important. Kevork Djansezian/Getty Images hide caption

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Could Big Batteries Be Big Business In California?
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Southern California's San Onofre Nuclear Generating Station, shown here in April 2012, was closed after small radiation leaks. Lenny Ignelzi/AP hide caption

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Environmentalists Split Over Need For Nuclear Power
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PG&E, a Northern California utility company, is already experimenting with big batteries to store wind-generated electricity at its Vaca-Dixon Substation. Richard Harris/NPR hide caption

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Big Batteries Needed To Make Fickle Wind And Solar Power Work
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Puddled meltwater very likely primed this ancient edge of the Antarctic's Larsen Ice Shelf to rapidly disintegrate over just several weeks. This view of the splintered mix of frozen bergs is from a Feb. 21, 2002, satellite image. Landsat 7 Science Team/NASA/GSFC hide caption

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Ready — Or Not. Abrupt Climate Changes Worry Scientists Most
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Wind turbines twirl above farmland on the outskirts of Madison, Wis. Not all locals are pleased. Scott Olson/Getty Images hide caption

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Slashing Fossil Fuel Consumption Comes With A Price
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Andres Quiroz, an installer for Stellar Solar, carries a solar panel during installation at a home in Encinitas, Calif. Sam Hodgson/Bloomberg via Getty Images hide caption

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Tech Leaders, Economists Split Over Clean Energy's Prospects
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By Accident, Scientists Discover Lakes Beneath Greenland
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The chimneys of the Kolaghat Thermal Power Station loom above a field flooded for rice farming near Mecheda, West Bengal, India, in July 2011. Dibyangshu Sarkar/AFP/Getty Images hide caption

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What's In It For U.S. To Cut Greenhouse Gas Emissions?
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