'Catastrophic': Great Barrier Reef hit by its most widespread coral bleaching, study finds - Coral bleaching on Great Barrier Reef reaches 'catastrophic' levels - Study shows wind patterns key in causing coral bleaching on Great Barrier Reef - Global coral bleaching event biggest on record: US agency - Coral bleachings devastate Bali reefs as sea temperatures rise - 'Most of it was dead': scientists discovers one of Great Barrier Reef's worst coral bleaching events - Future risk of coral bleaching set to intensify globally, researchers say - From flood damage to coral bleaching: Global warming hits ocean economies hard - Global coral bleaching event expanding to new countries: Scientists - 'Very unexpected and extreme': Coral bleaching has never been this bad, experts say