@ScottAdamsSays We can only see the rate of CO2 rise over last 700k years via ice core studies. Detailed record before that is missing (no ice older than that) so we do not know about CO2 rise rate throughout most of Earth's history.
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I'm not sure why it's more useful. Because it makes the analysis simpler? There have been 80k such 700k periods since the dinosaurs died. Maybe in one of them, there was a 20-year CO2 surge. My point is: We cannot know, can we?
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Plus, what happened to all the ice 700k years ago. It all melted. What was global temp then? How long did it have to be warm to melt it all? But melt it did in Greenland and Antarctica. That's why we cannot look back any further in time. And somehow the ice grew back.
End of conversation
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