A coral bleaching around the French Polynesian islands of Tahiti and Mo'orea is being described as the most devastating seen in years.
But what's worried scientists most is that it took them by surprise.
As ocean temperatures continue to warm because of climate change, they say that could be devastating for the Pacific - and the planet -- because coral reefs are vital.
Jamie Tahana reports.
Coral bleaching in Moorea Photo: Andrew Thurber
