trees ARE a renewable resource... its just that stupid people cut them down and dont replant them. The Indians used this kind of process, always replaced what they took, and it's possible to do the same in this day and age. Since there's SO much forest, we can continue to cut down the older stuff and by the time it's all gone, we could go to what we planted. It would work, and has been discussed in many agriculture magazines and books. The key is to get all the stumps out and burn them so the ground would be more fertile and facilitate large forestation. Our consumption for wood has been decreasing since we found metal, and it would be easy to conserve it if not for the idiotic logging companies who decide that the short term gains are more important than the long term losses of not replacing their woody quarry.