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Why are coral reefs bleaching?

01:02

According to the International Coral Reef Initiative, the world is witnessing its worst mass bleaching event on record, with 84 percent of coral reefs affected.

So what's driving this crisis?

From global warming and crown-of-thorns starfish outbreaks to destructive fishing, a leading Chinese marine biologist breaks down the triple threats pushing coral reefs to the brink.

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