Gaylord Nelson talks to reporters during an environmental conference in 2001, in Oshkosh, Wisconsin
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Mountaineer Stephanie Groen stands by a deep crevasse on a glacier in New Zealand, where she worries about signs of rapid ice-melt. (Courtesy: Stephanie Groen)
1. All homes on the Koung Jor Shan Refugee Camp on the Thai-Burma border have solar panels, making it the world's first solar-lit refugee camp. (The Branch Foundation)