California's cities have long been plagued by smog, but now some of the state's cleanest air is being polluted by smoke from climate change-fueled wildfires.
Poachers have killed more than 90 percent of Zambia's elephants since the 1950s. In response, villagers banded together to protect those in North Luangwa National Park last year.
A single study was the main catalyst for recent sunscreen ingredient bans, yet the science community is still debating those ingredients' effects on coral reefs—and even on sunscreen users.