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" ... Not mentioned was the fact that the major reef-builders of today, the scleractanian corals, have been around for some 200 million years. During most of that time the planet’s atmospheric CO2 concentrations were two to seven times higher than now, and temperatures were as much as 10-15 degrees Celsius warmer. And between 1572 and 1605 when atmospheric CO2 concentrations were about 100 ppm lower, the calcification rate of that coral was nearly one-quarter less. (Incidentally, numerous studies show that that no simple linkage has been established between higher temperatures and coral bleaching.) ... "