What is obvious is that the amount of CO2 in the atmosphere was anything but constant over long periods of time! Furthermore, how accurate and reliable these long term data are is questionable.
The first chart below also suggests a stability of the atmospheric CO2 concentration for the past roughly 10,000 years. Probably an artifact!
What is even more questionable is the correlation between atmospheric CO2 and e.g. earth surface temperatures. As one can see from the second chart there were tremendous fluctuations of earth temperatures over the past 500 million years. Within shorter periods you can suspect huge fluctuations as well.
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| Ignore the ridiculous projection beyond "today" |
Unfortunately, it appears not easy to find the original sources for these two charts. One source could be source1, source2
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