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And even if you did do that, where would you store the wood afterwards? You can't let it decay, that'd just put the carbon back into the atmosphere.
... don't cut them down?
You think trees don't die and fall down on their own?
Sometimes, sure.
And the rest of them just stay frozen upright forever, I suppose.
As long as new trees start at a higher rate than the old ones fall down...
This is not how forests work. They reach a saturation point quickly (in geological terms). What you need for continuous carbon sequestering is peat lands as the carbon gets turned into structures that aren't really bioavailable and the top layer slowly moves up.
That would require an ever-increasing amount of forested land. A carbon pyramid scheme. As soon as you stop increasing the forest's area it goes back to an equilibrium of trees decaying equalling trees growing.
By the time we run out of land we'll all be long gone, and there will be complementary solutions.
asdf
Another problem with storing carbon as cellulose is it uses up all the available water. So the trees would need to be cut down and turned into charcoal to release the H's and O's, and then buried.
The world isn't short of water. I'd be more concerned about phosphorus and other such mineral nutrients, those would get pulled out of the soil and then not returned.
Frankly, I think the best approach to sequestration is to make plastic and bury it. Plastic has a much more controllable chemical structure, you can be sure to only get carbon that way.
How do you convert atmospheric carbon into plastic?