Great Barrier Reef: Ancient coral samples show icon could recover

Great Barrier Reef: Ancient coral samples show icon could recover, but scientists warn of new threats

"The Great Barrier Reef once came close to extinction, new research into its history shows, which scientists say raises concerns for its future.

Scientists said core samples from an ancient reef show it could survive a sea level rise similar to that currently predicted, but warn it was facing extra threats this time round from ocean acidification and sediment.

Marine geologist Dr Belinda Dechnik, from the University of Sydney, is lead author of the report and part of an international team examining ancient core samples drilled from deep within the reef."

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