All coral reefs could die by the end of the century, new research shows. Before-and-after photos show what that would look like.

The few sites that could support reef restoration were in Baja California and the Red Sea.

"Honestly, most sites are out," Setter said in the release, adding, "by 2100, it's looking quite grim."

Environmentalist David Attenborough spoke about his first time scuba diving in the Great Barrier Reef in a BBC interview: "Below me there was a wonderland — a coral reef. On it, there were fish I never dreamed of, with colors I could only imagine, and there were all these other organisms that I had never seen before in my life."

Future divers, however, are unlikely to enjoy the same sights.