The earth was once covered in forest and the carbon was beneath the soil. Planting a tree reverses some of the damage done by deforestation. Bt reforesting the

The earth was once covered in forest and the carbon was beneath the soil. Planting a tree reverses some of the damage done by deforestation. Bt reforesting the earth would not restore things to how they were. As the OP said, that only happens if the excess CO2 is stored below the ground, too. Planting trees is good, but only part of the full sequestration needed.