This is why we won't solve climate change by simply planting trees. Planting trees is good but once the land is covered in trees like it was you can't go further. You have to start actively putting carbon underground so it doesn't end up in the air again.
Well, you can build shit with the wood that's going to last a long time and plant a new tree. Though I'm not sure the lumber processing & construction isn't producing more carbon than the tree sequesters...