All Coral Reefs will Die if 2C Climate Target Breached

There are reefs that have been around since before the dinosaurs roamed the planet. I was told that some of them are reefs in the farthest sense only but they are still ecosystems that are reef-like. And the planet has experienced a couple of warm periods with temperatures quite a bit higher than we have them now. Oh, and even the Great Barrier Reef has been around for about half a million years by now. And we know that during the last couple of warm periods over the last 10K years, temperatures were quite a bit higher than today for centuries. How did all the reefs survive in the past?

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