The good news is for the Earth and not us is that once in a hothouse state the hydrological cycle would go into hyperdrive and pull the CO2 out of the air by the weathering of rocks with carbonic acid and sequestering it in the form of limestone on the ocean floor and in lakes eventually leveling off at about 250ppm.
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I think AGW is for real although I don’t have a lot of confidence in the modeled projections of further global warming from it partially due to unanticipated/unmodeled negative feedback like has been mentioned here.