National Park Service Celebrates 100th Anniversary
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Solar Impulse 2 pilots Bertrand Piccard (right) and Andre Borschberg celebrate after Piccard landed their solar-powered plane at Moffett Field in Mountain View, Calif., on Saturday. Noah Berger/AP hide caption

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A map of the Amazon shelf showing the newly discovered reef structures in yellow. Courtesy of Carlos Rezende (UENF) and Fabiano Thompson (UFRJ) hide caption

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The World Resources Institute says you don't have to bid burgers bye-bye in order to reduce the environmental footprint of what you eat. For Americans, cutting back on beef (but not eliminating it altogether) could go a long way, it says. iStockphoto hide caption

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Phan Sopheak, a rice farmer in Cambodia, rests shortly after a man wielding an axe attacked her. She had been patrolling the Prey Lang forest around her village with a volunteer group that is trying to stop illegal logging. Courtesy of Prey Lang Community Network hide caption

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#EarthDay: The High Cost Of Eco-Activism
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U.S. Proposes Removing Yellowstone Grizzly Bears From Endangered Species List
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Secretary of State John Kerry holds his 2-year-old granddaughter, Isabel Dobbs-Higginson, as he signs a far-reaching climate accord at the United Nations, in a ceremony timed to coincide with Earth Day on Friday. Spencer Platt/Getty Images hide caption

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The Solar Impulse 2 airplane, piloted by Bertrand Piccard, gains altitude after taking off from Kalaeloa Airport in Kapolei, Hawaii during a test and training flight in April. Eugene Tanner /AFP/Getty Images hide caption

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Former FBI Director Robert Mueller, right, arrives for a court hearing in San Francisco Thursday. Mueller has been overseeing talks about a settlement between Volkswagen, the U.S. government, and the car company's customers. Jeff Chiu/AP hide caption

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President Obama met with China's president, Xi Jinping, at an event linked to the international climate conference held late last year outside Paris. Evan Vucci/AP hide caption

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Can The U.S. And China Keep Their Climate Pledges?
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More Charges Expected In Flint's Contaminated Drinking Water Case
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For Voters In Appalachian Region, Medical Care Is A Big Issue
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Workers install solar panels on the roof of a home in Camarillo, Calif., in 2013. San Francisco has recently decided to start requiring rooftop solar systems — electrical or heating — on new construction up to 10 stories tall. Anne Cusack/LA Times via Getty Images hide caption

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People in Boston enjoyed a late winter heat wave this past March. In much of the U.S., climate change is causing winters to warm faster than summers. Suzanne Kreiter/Boston Globe via Getty Images hide caption

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Climate Change? Some People May Not Be Sweating It Because The Weather Is Nicer
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Many glaciers are melting in Alaska. Scientists believe climate change is at work. Shankar Vedantam/NPR hide caption

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Why Our Brains Weren't Made To Deal With Climate Change
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About 14 percent of the Gigafactory in Nevada has been built so far. At 5.8 million square feet, it will be a building with one of the biggest footprints in the world. Tesla hide caption

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A Rare Look Inside The 'Gigafactory' Tesla Hopes Will Revolutionize Energy Use
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