Men watch the fires of a cremation along the banks of the Yamuna River against the backdrop of the Wazirabad Barrage and floating industrial waste.
David Gilkey/NPR
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The river enters Delhi relatively clean but by the time it flows out, it's a "toxic cocktail of sewage, industrial waste and surface runoff," says an environmentalist. Urbanization is partly to blame.
The head of the Panama Canal Authority, Jorge Quijano, center, opens the main valve to allow water into the flood chambers on the new set of locks on the Atlantic side of the Panama Canal in June 2015. The expansion of the canal, making it wider and deeper to accommodate larger ships, has taken nearly a decade. It opens next month.
Tito Herrera/AP
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Comedian George Carlin appears at Wheeler Opera House in Aspen, Colo., in 2007 during HBO's 13th Annual U.S. Comedy Arts Festival.
Jeff Kravitz/FilmMagic Inc for HBO/Getty Images
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Men watch the fires of a cremation along the banks of the Yamuna River against the backdrop of the Wazirabad Barrage and floating industrial waste.
David Gilkey/NPR
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San Francisco Bay at sunset, viewed from Oakland, Calif. By the end of the century sea level could rise by five feet because of global warming, according to climate scientists, flooding much of the bay's coastal infrastructure.
Marcio Jose Sanchez/AP
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