Mass coral bleaching hits Great Barrier Reef for the fifth time in eight years

Hundreds of sites across most of the Great Barrier Reef are turning white from heat stress in the fifth mass coral bleaching event in eight years.
Aerial surveys over two-thirds of the reef have confirmed "widespread" bleaching, the Great Barrier Reef Marine Park Authority said on Friday.
Climate change is the biggest threat to tropical reefs worldwide, and coral bleaching is caused by heat stress.
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