Australia Faces Alarming Coral Loss in Great Barrier Reef

Australia’s Great Barrier Reef has experienced its most severe coral decline on record, according to a new report by the Australian Institute of Marine Sciences. The latest findings revealed that two of the reef’s three regions - the northern and southern sections - saw coral cover plummet by 25% to 33% over the past year, marking the largest annual drop since monitoring began in 1986.

This sharp decline followed a mass coral bleaching event during the summer of 2024, which had the largest footprint ever recorded. The bleaching impacted all three reef regions with high to extreme severity, putting significant stress on the reef’s delicate ecosystem. Scientists pointed to a worrying increase in the volatility of coral cover - a trend emerging over the last 15 years due to escalating climate stress.

“The reef is showing signs of greater instability,” said Mike Emslie, head of the long-term monitoring program. “These patterns point to an ecosystem struggling to recover in the face of repeated environmental shocks.” Since 2016, the reef has endured five major bleaching events, with each one amplifying the damage left by the last.

Although UNESCO has not yet listed the reef as “in danger,” it continues to recommend that status. The Australian government has pushed back, mindful of the reef’s A$6.4 billion ($4.2 billion) economic contribution, particularly through tourism. However, as warming seas continue to threaten coral resilience, the future of Australia’s most iconic natural wonder remains uncertain.

Coral loss at this scale is a warning shot for every business with reef-catchment exposure - agriculture, mining, tourism, ports - because TNFD and CSRD are steadily turning nature risk into a disclosable financial issue. Our nature-based-solutions and sustainability-due-diligence teams help clients quantify their reef and marine exposure and build disclosure infrastructure that stands up to the intensifying scrutiny.