I see this post is old but,
Yes Len, a great deal of research points in the direction that it is more temperature than acidity (pH). The species of coral that have evolved to live in these waters cannot take the 1-2 degree change in water temperature that is happening and are simlpy dying. There is a arge amountl of info on the web if you are interested further.
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Life is to short to be crabby. Go sailing!