if it from a managed forest, several more will be planted. But, if it is in a housing area, it is almost surely lost for the foreseeable future. That is where the main problem is, and where environmentalists really need to focus...lots of trees are cut down needlessly and topsoil just bulldozed, not because bulldozers have to have it that way, but there is just a feeling that they do. I have seen bulldozers stop on a dime and they can leave trees standing quite easily. It is more a culture that has been accepted by too many people for too long. Some cities are calculating the worth of trees, I think Bellevue, WA is one, and taxing for their replacement. Hope to see more of that.   mg