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A prolonged summer heatwave in Australia left 91 per cent of the Great Barrier Reef's coral damaged by bleaching, according to a new government monitoring report. It was the first time on record the reef had suffered bleaching during a La Nina weather cycle, when temperatures would normally be expected to be cooler. The Reef Snapshot report offered new detail on the damage caused by the fourth "mass bleaching" the world's largest coral reef system has experienced since 2016, which was first revealed in March. The Great Barrier Reef Marine Park Authority, which published the report on 10 May 2022, conducted extensive surveys of the World Heritage-listed reef between September 2021 and March 2022.