A channel big enough to handle global shipping would require deep dredging throughout Lake Nicaragua, the largest source of fresh water in Central America. Esteban Felix/AP hide caption

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Scientists Fear Ecological Disaster In Nicaragua's Planned Canal

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Report: Burning Natural Gas Is Better Than Using Coal

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Until recently, finding characteristic stone and bone tools was the only way to trace the fate of the Clovis people, whose culture appeared in North America about 13,000 years ago. Sarah L. Anzick/Nature hide caption

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Ancient DNA Ties Native Americans From Two Continents To Clovis

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Clive Hamilton's new book Earthmasters. Courtesy of Yale University Press hide caption

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Risky Tech Fixes For Climate Becoming Likelier, Critic Warns

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The Climate Casino by William Nordhaus looks at the economics and politics of global warming. Courtesy of Yale University Press hide caption

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Economist Says Best Climate Fix A Tough Sell, But Worth It

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Massive sections of ice (center front) have broken away from the Jakobshavn glacier into the sea. There's enough water stored in Greenland's glaciers to raise the sea level by 20 feet. Ian Joughin/Science/AAAS hide caption

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Glacier Blamed For Berg That Sank Titanic Unleashes More Ice

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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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