Journalist Chai Jing used $160,000 of her own money to produce a documentary on China's air pollution problem. Screenshot/Under the Dome hide caption

itoggle caption Screenshot/Under the Dome

A waitress serves shark fin soup in a restaurant in Guangzhou, in southern China's Guangdong province on Aug. 10, 2014. Johannes Eisele/AFP/Getty Images hide caption

itoggle caption Johannes Eisele/AFP/Getty Images

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

Tim Meyers on his four-acre vegetable farm in southwestern Alaska. Behind him: an endless sea of tundra, and a glimpse of the town of Bethel. Eugenie Frerichs for NPR hide caption

itoggle caption Eugenie Frerichs for NPR

Smoke rises from chimneys of coal-based power plants in the Sonbhadra District of Uttar Pradesh, India. The Washington Post/Getty Images hide caption

itoggle caption The Washington Post/Getty Images

A truck drives on top of a levee that protects a soybean field in New Madrid County, Mo., when the Mississippi River floods. Kristofor Husted/KBIA hide caption

itoggle caption Kristofor Husted/KBIA

Quinault Indian Nation President Fawn Sharp stands on the docks as tribal crabbers unload their catch. The tribe has vowed to fight the oil train-to-ship terminals proposed for Grays Harbor. Ashley Ahearn/KUOW hide caption

itoggle caption Ashley Ahearn/KUOW

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