Read here. Climate science alarmists predicted that coral reefs would decline due to increase ocean "acidification" from human CO2 emissions. To test that prediction, scientists examined over 1,900 coral reefs in the Caribbean over a 35 year span. Other than an outbreak of a coral disease in 1981, the coral reefs have been stable, showing no impacts from changes in water pH.
"Schutte et al., as they describe it, "analyzed the spatio-temporal trends of benthic coral reef communities in the Caribbean using quantitative data from 3,777 coral cover surveys of 1,962 reefs from 1971-2006".....Clearly, the temporal history of Caribbean coral cover change does not bear any resemblance to the gradual and continuous decline that could have been expected from the concomitant increase in oceanic pCO2 and decrease in pH. Indeed, after suffering the sharp one-year decline caused by the white band disease outbreak, coral cover once again stabilized, which phenomenon, in the words of Schutte et al., "could be interpreted as relatively good news""