It's worth pointing out that old growth timber operations and lumber products ARE actually reproducible forever with intensive management on a small scale. With what some might say is proper respect for the forests. You will get wildlife, and recreation, and cultural values, and food gathering, and hunting, and strategic timber harvest that provide physical/monetary value. You may not get the volume of 2x4s out of Home Depot, but it is is, technically and ecologically, a forever sustainable source of wood. Until the sun stops shining.