This article is bad news for AGW fanatics for two reasons. One is that is gives still more evidence that changes in climate have (horrors!) happened so often throughout history that genetics of many forms of life have changed to (horrors again!) adapt to it!! So changes in climate are mundane, not a cause for beard-tearing and casting one's self off parapets. Another bad thing of course is the information that the climate changed MILLIONS OF YEARS AGO long before there were SUVs, herds of cows, or algore's bank account.
http://phys.org/news/2016-11-corals-survived-caribbean-climate.html