World's oceans facing biggest coral die-off in history, scientists warn

A third global bleaching of coral reefs is underway following a massive and persistent underwater heatwave

Scientists have confirmed the third-ever global bleaching of coral reefs is under way and warned it could see the biggest coral die-off in history.

Since 2014, a massive underwater heatwave, driven by climate change, has caused corals to lose their brilliance and die in every ocean. By the end of this year 38% of the world's reefs will have been affected. About 5% will have died forever.