Ningaloo: Australia's coral reefs bleached by marine heatwave

Katy WatsonAustralia correspondentReporting fromWestern AustraliaWatch: Can you un-bleach coral? BBC visits remote Australian reef to find outAustralia boasts plenty of superlatives when it comes to its natural landmarks. The Great Barrier Reef, the world's biggest coral reef system on the north-east coast, is rightly recognised as a Unesco World Heritage Site. Buzzing with biodiversity, it's a diver's dream.But…