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Australia's Great Barrier Reef has lost 50% of its coral populations in the last three decades, with climate change a key driver of reef disturbance, a new study has found. Researchers from the ARC Centre of Excellence for Coral Reef Studies, in Queensland, northeastern Australia, assessed coral communities and their colony size along the length of the Great Barrier Reef between 1995 and 2017, finding depletion of virtually all coral populations, they said Tuesday.