IIRC, a tree absorbs up to 3 tons/year, and takes a bunch of years to get to that stage.

The trees also don't sequester underground, and will need surface area staying as forest for the rest of time.

As many have echoed: an ounce of prevention saves a pound of cure. Most bang for our buck would be to change our lifestyle and regulations. But as that's not feasible we're at the geo engineering and artificial sequestration stage.