The offshore wind farm in the North Sea near Borkum, Germany, is nearly complete. The Riffgat facility, seen here on June 23, includes 30 turbines, each with a generating capacity of 3.6 megawatts. David Hecker/Getty Images hide caption

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Roughnecks build a drilling rig at the MEG Energy site near Fort McMurray, Alberta, Canada. In addition to large, open-pit mining operations, tar sands oil can be extracted from the ground by pumping down high-pressure steam. Michael S. Williamson/The Washington Post/Getty Images hide caption

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Golden lion tamarins are one species that are largely monogamous. Felipe Dana/AP hide caption

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The Crosstex NGL Pipeline is just one such project in the country that has forced long, unwanted legal battles between oil companies and landowners. Mose Buchele/KUT hide caption

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The remains of a tree are seen in front of a boulder in the Dome Wilderness area of New Mexico in August 2012. The Las Conchas Fire torched the land in 2011, burning through more than 150,000 acres of forest. David Gilkey/NPR hide caption

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The Ivanpah solar project in California's Mojave Desert will be the largest solar power plant of its kind in the world. Josh Cassidy/KQED hide caption

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Echolocation is second nature to animals such as bats and dolphins. Can humans also find their way using sound as a tool? Ian Waldie/Getty Images hide caption

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The Asian tiger mosquito, an invasive, disease-carrying pest, was likely introduced to the United States from used tires shipped over from Asia. Jim Newman/University of Florida/IFAS/AP hide caption

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The beaked whale is one of the most vulnerable of all whale species to underwater noise pollution. Robin Baird/Cascadia Research hide caption

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Johnson with her fellow researcher and sometimes husband, William Masters. The pair helped legitimize the study of human sexuality. AP hide caption

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