Comment by rcxdude
>Anyway we have great carbon capture machines readily available. All plants and trees do this naturally
They do, but it also gets released again unless you take extra steps. And it's not all that efficient: you'd need to grow something the size of the amazon, then cut it down and bury it, to have a notable effect. Other proposed options for carbon capture are already more efficient than that, and as you've noted they've still not taken off.
> but it also gets released again
Quite slowly. Lignin, which makes up about 30% of woody biomass, is very difficult to break down biologically. Only a few specialized bacteria and fungi have the enzymes for it.
We don't need to sequester carbon permanently, we just need to bind enough of it into soil carbon to reduce the concentration of CO2 in the atmosphere. The long residence time of carbon in the soil is sufficient for this purpose.