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AAP
AAP
Environment
Tracey Ferrier

RARE PHOTOS: Coral reefs hit by fourth global bleaching event | Rare Historical Photos

The world's reefs are facing a mass bleaching event, which has already hit the Great Barrier Reef. (HANDOUT/DIVERS FOR CLIMATE)

The world is in the grip of a fourth mass coral bleaching event caused by record-breaking ocean heat, scientists say.

The declaration by the US National Oceanic and Atmospheric Administration comes as Australia's Great Barrier Reef suffers its fifth mass bleaching event in eight years.

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