This guy has obviously not actually been out to the reef.
I scuba the GBR off Cairns in 2002 doing my Open Water, visited exactly the same sections in 2013 for my Advanced Open Water.
The difference on the reefs visited were stark, some sections had zero living coral & the rest had a lot of dead coral covered in brown algae.
There are two main types of coral. One that takes approximately 5 years to recover from a bleaching event & another approximately 10 years.
The problem is that the bleaching events are occurring more frequently to such an extent that the 10 year corals are not recovering at all between events.
So even an apparently 'healthy reef' may have lost significant biodiversity.
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And more bovine excrement from their ABC., page-117
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