I mean, that's the mechanism by which carbon is removed. It goes into tree, tree dies or gets cut down taking all the solidified carbon with it, new tree gets planted in its place to repeat the cycle. In fact, the fastest way to scrub carbon with the practice is to farm trees, assuming you do it sustainably.
Only the current generation of trees. The previous generations that have been broken down into soil are mostly not going back into the atmosphere as co2
Yes. Growing a tree from sapling to a giant trunk removes significantly more carbon from the atmosphere than an existing trunk sitting there at mass, unable to store much more carbon.
And yes, that's why I clarified that new trees would need to be planted, right on the money.