In 2025, coral cover in the Great Barrier Reef’s northern region fell to 30% after its largest annual decline on record; a year later, surveys of 192 reefs found it had risen to 35.1% despite another bleaching event

The last two years have been a tale of two extremes for the Great Barrier Reef.” In 2025, the northern region of the reef experienced its biggest annual decline in coral cover on record, dropping to just 30% after a catastrophic mass bleaching event. It was a sobering milestone in a long history of climate-induced disruptions.

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