Australia on Friday declared that the Great Barrier Reef is suffering "mass bleaching" as corals lose their colour under the stress of warmer seas. The Great Barrier Reef Marine Park Authority said in a weekly update most of the marine park had been hit by "significant heat stress" over the summer, with water temperatures in some areas as much as 2-4 degrees Celsius above average.

Australia's Great Barrier Reef suffers sixth mass bleaching event

Today the world is observing World Environment day and millions are posting on social media about saving the planet and this year's theme is "Time for Nature". Watch report.

World Environment Day: The great barrier reef turns 'white'

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Australia's Great Barrier Reef suffers sixth mass bleaching event

World Environment Day: The great barrier reef turns 'white'