I initially thought it didn't look good when looking at the amount absorbed yearly per tree, but then was surprised by some estimates on how many trees you can fit per unit area. A more accurate estimate needs to be done though, different numbers I found put the final range at about an order of magnitude.

Also, most farming and stable forests are mostly carbon neutral. This would require continual seeding, harvesting and sequestration of the cellulose. Maybe it will be a good thing though that cellulose+lignins are so hard to breakdown.