> This is likely associated with sea changes too so what happened to all the coral? Did it die and regrow? Did it adapt?

Well, before you pat yourself and feel safe, you'd better answer those questions instead of just asking them and deciding the answer will go on a direction you like.

Coral is a weird kind of organism, we can't expect it to adapt like insects. It changing can be quite bad.

But yeah, we won't have runaway warming. I don't know what the people that invented that risk were thinking.