A civilization as advanced as ours would have to have bootstrapped via coal mining and burning like we did, and that would leave evidence in the CO2 records in

A civilization as advanced as ours would have to have bootstrapped via coal mining and burning like we did, and that would leave evidence in the CO2 records in the ice cores. There does not seem to be any evidence of such an advanced civilization in the ice cores, unless it wasn't remotely global in scope. There could have been less advanced (but still advanced) not-global-in-scope civilizations that we don't yet know about, but I don't see the link to the Carolina bays, unless it's to say that the same event wiped them out, but so what, I'm interested in the Carolina bays and their cause, and much less interested in speculation about advanced civilizations.