I did the math a while ago, and there’s a straightforward way we can solve this with hemp/cannabis/marijuana. It would take us 10 years to clean up the carbon we’ve released in the last.12,000 since we started smelting copper, but that requires 5,000,000,000 acres of constant hemp/* production with 4 harvests per year, and all the roots collected, compressed, and dumped into the Marianas trench. Once we did that, even at current emission levels we can cut back to 2,500,000,000 acres of production, and taper off as we manage to hit zero emissions. Effectively giving us a global “thermostat.”
Of course the problem here is that you’d need the buy in of almost every single country on Earth, but the plants can be used for food, fuel, clothing, paper, housing, concrete, and a lot of other things, so it could actually be a net profit to the global economy.