&gt; The fix is hard, requiring decades to reach the necessary policy changes, and decades more for those to play out in built infrastructure.<p>I agree that finding the issued in place would be time consuming, expensive and difficult.  However, it is possible we are seeing a different way of fixing the issue: migration back to the urban core with the downtown revitalization of many cities.<p>Or building new areas that have different characteristics: Stapleton here in Colorado is a mixed use neighborhood built in the last decade or so.  Not perfect, but a different set of mistakes.