Great Barrier Reef has lost half of its corals

Half of the Great Barrier Reef's corals have died over the past 25 years, scientists said yesterdeay, warning that climate change is irreversibly destroying the underwater ecosystem.

A study published in the Proceedings of the Royal Society Journal found an alarming rate of decline across all sizes of corals since the mid-1990s on the vast World Heritage-listed reef off Australia's northeastern coast.

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Larger species, such as branching and table-shaped corals, have been affected hardest -- almost disappearing from the far northern reaches of the reef.

"They're typically depleted by (up to) 80 or 90 percent compared to 25 years ago," report co-author and James Cook University professor Terry Hughes told AFP.

Aside from its inestimable natural, scientific and environmental value, the 2,300-kilometre-long (1,400-mile-long) reef was worth an estimated $4 billion a year in tourism revenue for the Australian economy before the coronavirus pandemic.