Indeed, torridon, and along the way we managed to cover War and Peace! As I noted on one of my earlier posts in a seemingly futile attemot to keep thread on topic, even when we discuss issues that may have an impact such as disposal of our own faecal matter, we seem to do so without any real analysis or facts. This is, in the main, due to it being difficult to find any facts on such subjects because minimal, if any, analysis has been done on huge ranges of activities, because the will isn't really there.
Thus, individuals are forced, either to ignore the impacts of most activities, or apply a set of unvalidated or naive heuristics, so that we end up with 'chemicals bad', or 'primitive good', or 'recycling good' as mantras that we apply unthinkingly and sans numbers. Society seems to work more as a giant conglomerated rule of thumb than anything more scientific. Again as mentioned, it seems we lack both the will and the method to do anything better.