Yeah, I was doing some rough calculations.

Mass of earth's atmosphere: 5.1 * 10 ** 18 kilos, which is 5.1 * 10 ** 15 metric tons.

Concentration of CO2 in atmosphere: 415 parts per million as of 2021, according to NOAA.

That means the total amount of CO2 in the atmosphere is 2,282,500,000 metric tons, give or take. To get us back to 1960 levels, we'd need to remove a fourth of that.

That 2.3 gigatons seems over an order of magnitude lower than the 50 gigatons you mentioned. How'd you get your number? Have I slipped a decimal place somewhere?

Regardless, this vast scale is why I'm deeply doubtful about the feasibility of industrial carbon-capture solutions.

Edit: Markdown doesn't like programmer-ish numerical expressions.