Great Barrier Reef has suffered its worst die-off ever recorded

During the past two years, Australia's iconic Great Barrier Reef suffered its largest die-off ever recorded — with an average of 67 percent of corals in one area declared dead, scientists said on Monday. The cause was unusually warm waters that pushed the intricate ecosystems past their limits of survival.
The worst affected area is a 430 mile section of reefs in the northern part of the reef that has lost an average of 67 percent of its shallow water corals in just the past 8 to 9 months