Evidence that Australia's Great Barrier Reef is experiencing its worst coral bleaching on record has renewed calls for the UN to list it as "in-danger"....
...Unesco voted not to put the reef on its World Heritage in Danger list last year, but green groups want the decision reassessed.
http://www.bbc.com/news/world-australia-35914009

An aerial survey of the northern Great Barrier Reef has shown that 95 per cent of the reefs are now severely bleached — far worse than previously thought.
Professor Terry Hughes, a coral reef expert based at James Cook University in Townsville who led the survey team, said the situation is now critical.
"This will change the Great Barrier Reef forever," Professor Hughes told 7.30.
"We're seeing huge levels of bleaching in the northern thousand-kilometre stretch of the Great Barrier Reef."
Of the 520 reefs he surveyed, only four showed no evidence of bleaching.
From Cairns to the Torres Strait, the once colourful ribbons of reef are a ghostly white.
"It's too early to tell precisely how many of the bleached coral will die, but judging from the extreme level even the most robust corals are snow white, I'd expect to see about half of those corals die in the coming month or so," Professor Hughes said....
http://www.abc.net.au/news/2016-03-28/great-barrier-reef-coral-bleaching-95-per-cent-north-section/7279338