Fernandina's Flicker (Colaptes fernandinae), a woodpecker found only in Cuba. Pete Oxford/Minden Pictures/Corbis hide caption

itoggle caption Pete Oxford/Minden Pictures/Corbis

Crew members pull an oyster dredge in Tangier Sound of the Chesapeake Bay near Deal Island, Md., in 2013. A study found that the Chesapeake Bay shellfishery is a "hot zone" for ocean acidification. Patrick Semansky/AP hide caption

itoggle caption Patrick Semansky/AP

A fisherman collects water on a beach littered with trash at an ecological reserve south of Manila in 2013. Francis R. Malasig/EPA/Landov hide caption

itoggle caption Francis R. Malasig/EPA/Landov

Fish on ice in Palau Misa Island, Indonesia. Thanks to satellite data, John Amos of SkyTruth can track fishing activity near the Pacific island nation from his office in West Virginia. Randy Olson/National Geographic/Getty Images hide caption

itoggle caption Randy Olson/National Geographic/Getty Images

These amphipods were discovered by scientists from the University of Aberdeen in waters more than 4 miles deep, north of New Zealand. Similar shrimplike crawlers may lurk at the bottom of the Challenger Deep. Oceanlab/University of Aberdeen/AP hide caption

itoggle caption Oceanlab/University of Aberdeen/AP

Country representatives listen to opening remarks at the start of the United Nations' Conference of the Parties on Climate Change in Lima, Peru. Cris Bouroncle/AFP/Getty Images hide caption

itoggle caption Cris Bouroncle/AFP/Getty Images