Half of Great Barrier Reef 'disappeared' in past 27 years

2 October 2012 Last updated at 02:07 ET Help

More than half of Australia's Great Barrier Reef has disappeared in the past 27 years, according to a new study by scientists.

Various factors, including cyclones, coral bleaching and the Crown of Thorns starfish, have been blamed.

The BBC's Duncan Kennedy reports from Sydney.

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