Environment Breaking news on the environment, climate change, pollution, and endangered species. Also featuring Climate Connections, a special series on climate change co-produced by NPR and National Geographic.

A Kenya Wildlife Services ranger stands guard in front illegal stockpiles of burning elephant tusks at the Nairobi National Park on April 30, 2016. Carl De Souza/AFP/Getty Images hide caption

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Carl De Souza/AFP/Getty Images

Up In Flames: Kenya Burns More Than 100 Tons Of Ivory

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The Large Hadron Collider uses superconducting magnets to smash sub-atomic particles together at enormous energies. CERN hide caption

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CERN

Weasel Apparently Shuts Down World's Most Powerful Particle Collider

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Cybil Preston, chief apiary inspector for the Maryland Department of Agriculture, does a training run with Mack: She sets up fake beehives and commands him to "find." He sniffs each of them to check for American foulbrood. He has been trained to sit to notify Preston if he detects the disease. Morgan McCloy/NPR hide caption

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Morgan McCloy/NPR

National Park Service Celebrates 100th Anniversary

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Ariel Zambelich/NPR

Phone, Everlasting: What If Your Smartphone Never Got Old?

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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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Noah Berger/AP

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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Courtesy of Carlos Rezende (UENF) and Fabiano Thompson (UFRJ)

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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iStockphoto

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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Courtesy of Prey Lang Community Network

#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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Spencer Platt/Getty Images

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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Eugene Tanner /AFP/Getty Images

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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Jeff Chiu/AP