Bleaching happens when coral gets stressed and turns white 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 but this is the first global evidence of how this episode is affecting sea life.
The US National Oceanic and Atmospheric Administration (NOAA) confirmed the mass stress after weeks of receiving reports from scientists globally.
The bleached coral can look beautiful in pictures but scientists that dive to examine the reefs say that up close the coral is clearly ill and decaying.
Image source, AIMS
Scientists in the US, Australia, Kenya and Brazil told BBC News about feeling dismay and even anger as they watched the coral they love threatened or killed by warm oceans.
The first warning signs were in the Caribbean last year when bathers found the water off the coast of Florida was as warm as a hot tub.
That heat moved into the southern hemisphere. It
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