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 Tuesday.

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…

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…