Corals turning white and dying after recordheat, say scientists | BBC News

Coral around the world is turning white and even dyingas recent record ocean heat takes a devastating toll.

It has triggered the fourth global mass coral bleachingevent, according to the US National Oceanic andAtmospheric Administration (NOAA).

Bleaching happens when coral gets stressed and turnswhite because the water it lives in is too hot.

Coral sustains ocean life, fishing, and creates trillions of dollars of revenue annually.

Ocean heat records have been falling for months butthis is the first global evidence of how this episode is. affecting sea life.

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