Guardian: Almost 93% of reefs on the Great Barrier Reef have been hit by coral bleaching, according to a comprehensive survey revealing the full extent of the devastation caused by abnormally warm ocean temperatures sweeping the globe.
There have only been three mass bleaching events recorded on the reef , and all of them have happened since 1998. Scientists say this episode is the worst theyve ever seen.
The world is in the midst of a global bleaching event, which is a result of a pulse of warm water...