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CO2 peaks and “past civilizations”
As the most abundant greenhouse gas in our atmosphere, CO2 levels have varied widely over the course of the Earth’s 4.54 billion year history.

Source: A Graphical History of Atmospheric CO2 Levels Over Time | Earth.Org - Past | Present | Future

Some people could hypotize that there have been three or four "industrial civilizations" before us in the last million year
https://monodes.com/predaelli/2022/05/26/co2-peaks-and-past-civilizations/
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#fun

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