How a single heat wave put these crucial Florida corals on the path to extinction

Recent record-breaking ocean temperatures have killed off so many elkhorn and staghorn corals, they are on the verge of disappearing completely, scientists have found.

​ Recent record-breaking ocean temperatures have killed off so many elkhorn and staghorn corals, they are on the verge of disappearing completely, scientists have found. Read More Breaking News, Latest News and Videos | CNN