At least 33 percent of natural World Heritage sites are threatened by climate change, the UN observer body says. These sites include the Great Barrier Reef in Australia, the world’s largest coral reef.
Local marine biologists say the annual event, off the coast of Queensland in northeastern Australia, could be among the biggest in recent years.
Conservationists say a new funding to restore and protect the Great Barrier Reef is "an important step" while the biggest threat to the reef is global warming.
A study conducted by Deloitte Access Economics found that the Great Barrier Reef is worth $42 billion and underpins 64,000 jobs.
Seven percent of Australia's Great Barrier Reef untouched by mass bleaching
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