A scientist who recently visited the Great Barrier Reef has said "if it was a person, it would be on life support", as researchers strive to highlight the plight of the reef.
New images have shown the worrying extent of the damage done to the reef by climate change.
Rising water temperatures have damaged the worlds largest reef system, which stretches for over 1,400 miles off the coast of Australia.
In May, researchers found that more than a third of the coral in northern and central parts of the reefs was dead, and 93 per cent of individual reefs had been affected by a condition known as coral bleaching.
This usually leads the corals to die as it ends their symbiotic relationship with algae-like single cell protozoa, which are expelled when corals are exposed to water which is too warm.
Scientists have found that the situation has worsened.
Amanda McKenzie, CEO of the Australian Climate Council, told ABC: "After the bleaching event in May, 60 per cent of what we saw was bleached very white.
"Another 19-20 per cent was covered in sludgy brown algae. Even of what remained healthy, some looked a bit on edge.
"When we went back a few weeks ago to see if they had recovered or died, quite a large proportion had died."