Great Barrier Reef suffers third mass coral bleaching event in five years

Renowned scientist Terry Hughes says huge swathes of reef have been affected in a 'severe' situation

The Great Barrier Reef has experienced a third mass coral bleaching event in five years, according to the scientist carrying out aerial surveys over hundreds of individual reefs.

With three days of a nine-day survey to go, Prof Terry Hughes told Guardian Australia: "We know this is a mass bleaching event and it's a severe one."