Photo: Yonhap News
Scientists in Australia say more than half of the corals that make up the Great Barrier Reef have died over the past 25 years because of warmer seas.
The BBC's Phil Mercer reports.
There is no time to lose.
That's the stark warning from Australian researchers about the health of the world's largest reef system.
They say its coral has been under a sustained attack by warmer seas driven by climate change.
This causes bleaching.
Under stress, the corals expel symbiotic algae, which lives in their tissues and gives them their color and energy.
The study asserts that this is comprising the Great Barrier Reef's ability to recover.
Please send comments to email@example.com / copyright © tbs. Unauthorized redistribution prohibited.