First, the meme that all that damage is caused by temperature change is rubbish and an exercise in misdirection. The most probable cause is agricultural run off which has been heavy in nitrogen for the past several generations. As well that run off will be in the surface waters most likely to affect reefs.
The switch out to organic agriculture will allow these reefs to completely reverse and stage a total recovery.
In the meantime we have this nonsense to put up with in order to hide the true culprit..