Oh I agree, only Nature is truly abundant, all human activities that claim to be abundant are either virtual (non-existent outside the realm of machines) or based on natural processes!
In an interview with Ben Falk (or it could have been in his book, not sure) he talks about the sentiment of Bill Mollison that an yield of a natural system is unlimited. The idea being that Nature , if fostered and not destroyed, will always yield more than we can make use of. So from that thought stems the principle that it's better to have half an acre of properly managed, regenerative and fully productive system than 10 acres of badly managed one.