<i>Past increase of atmospheric CO2 level has been exponential, at a constant CAGR of between 0.4% and 0.5% per year.</i>
If that were true, Max, it would have been 145 ppmv 200 years ago. It's never been that low in the last billion years or more. Check your math.
<i>So, as a result, it is logical to assume that warming from added CO2 should increase linearly (not exponentially)</i>
Max, you evidently meet a wider range of people than me if you know someone that thinks warming from added CO2 is increasing exponentially. Do them a favor and suggest they check their math.
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