sic,
did you just defeat your own argumnent? it has been suggested by many on this thread (and you have ceded this point) that prehistoric/paleolithic humans had devestating impacts on native ecosystems into which they entered (including navajo, etc.). yet, as you say, these people remain 13000 years later. the apparent contradiction calls into question how humanity can simultaneously deplete resources and yet maintain or improve its material efficiency., and, as you have also ceded, the snswer must involve technological innovation (improved agricultural practices, building techniques, etc.). this seems to me to encapsulate the entire debate. you maintain that under current practices, whcih are far greater in magnitude than in the past, humanity cannot keep up its rate of production, which is likely true. however, your argument precludes the possibility of continuing the cycle of overgrowth and innovation, which has served so well and which (correct me if i'm wrong) your opponents suggest is the only plausible way forward. so, rather than revert to a minimized version of exactly the smae process, is it not more logical to reconcile your notion of following historical precednet with its propensity for scientific development?
ps... sorry for any typos; i'm on my phome