The reef avoided being listed as endangered in July, despite the United Nations reporting "utmost concern" about mass coral bleaching and the impact of climate change.

AUCKLAND: Australia's Great Barrier Reef is at a very high risk of extreme and widespread bleaching and "ecosystem collapse" linked to this year's El Nino weather phenomenon, top scientists warned on Tuesday (Jul 21).Often dubbed the world's largest living structure, the reef stretches 2,300km along the coast