This should be easy to confirm or refute. What percentage of our atmosphere is comprised of CO2 and how much higher is it compared to centuries past?
RE: how much higher is it compared to centuries past?
How accurately have scientists in the past measured and kept CO2 data levels?
Surely you jest with that question.
If that’s not sarcasm, you have no business commenting on climate & CO2. There are MANY papers which outline the facts; you need only have the will to find them.