Most forests in North America are not mature. Consider how tall redwood trees can get. Also, trees are converted into wood and paper. Generally that wood isn't

Most forests in North America are not mature. Consider how tall redwood trees can get. Also, trees are converted into wood and paper. Generally that wood isn't burned and returned to the atmosphere. Why not suggest the whole planet is carbon neutral at that point? It is meaningless because we only care about the carbon in the atmosphere.