Scientists tackle starfish plagues on endangered Great Barrier Reef May 31, 2020 half of the reef’s coral has been lost +3 In the past 30 years largely because of bleaching events and crown-of-thorns starfish outbreaks.. IFTTT Science Washington Post half of the reef’s coral has been lost In the past 30 years largely because of bleaching events and crown-of-thorns starfish outbreaks.. IFTTT Science Washington Post