Properly managed agroforestry is an excellent carbon sink, where properly managed is doing all of the heavy lifting here. The napkin strategy is to grow fast w

Properly managed agroforestry is an excellent carbon sink, where properly managed is doing all of the heavy lifting here. The napkin strategy is to grow fast woods, kiln them into charcoal, spread some of it on the forest as a soil amendment, spread the rest on agricultural land, repeat. Elemental carbon weatherizes into CO2 very slowly, on the order of centuries, the half-life is more than a thousand years. So-called "biochar" (it's just charcoal) is an excellent soil amendment, mitigates topsoil depletion, supports good microbiomes, adsorbs fertilizers and releases them slowly, it's a big win. If we manage to do this on the necessary scale, we might eventually hit the point where adding more char to soil isn't worth it from an ecosystem health perspective, and then we can just put it into the various large holes we've dug into the earth to extract minerals. There is something very tidy about filling an old coal mine with synthetic coal!