[anotherpaulg]

I like the unconventional approach. A few minutes with GPT raises two issues:

1. We've raised CO2 from 280ppm to 420ppm, about a 50% increase. To dilute it back down would require 50% more total atmosphere. This would also raise the surface air pressure 1.5x.

2. How much heat is trapped is related to the absolute amount of CO2 in the atmosphere, not the fraction. So the diluted atmosphere would retain just as much heat.

[vscode-rest]

Would it increase the steady state surface air pressure by 50%, or would more molecules offgas into outer space to compensate?

If the latter, it might actually work. Assuming they offgas at-proportion. Which they probably wouldn’t…