Great Barrier Reef on sixth life in 30,000 years: Study
Australia's Great Barrier Reef has returned from near-extinction five times in the past 30,000 years, researchers said. The World Heritage site is suffering from acidic oceans and coral bleaching due to warmer sea temperatures linked to climate change. The last death event was about 10,000 years ago, due to a massive sediment dump amidst a higher sea level, said scientists.