Despite new pledges to cut emissions, the world is not on track to hit a key climate change target of limiting warming. Scientists warn a planet that heats up more than that will look very different.

Photographer David Doubilet first dove below the surface at age 8 and has spent a lifetime making underwater images. He talks to NPR about his new book: Two Worlds: Above and Below the Sea.

Rising ocean temperatures killed 14% of the world's coral reefs, a new analysis finds. But it's not without hope: Experts say many can recover if immediate action is taken to curb future warming.