Just a thought. I beleive the world is closer than you think. Yes, we developed scarey weapons that could destroy the planet and nuclear power, which generates waste which is dangerous for a long, long time, and wes we have got here very fast but we live in equilibrium, we are part of this planet and this planet is a bio sphere in a way. Optimisticly I don't think we can destroy the planet we can only change its form slightly, most people on the planet are begining to get closer, we're trying not to make to much mess, trying to down grade the weapons and warfare to be more civilised(?) Things are looking good. OR we are foriegn to this planet, we came from a similar planet and split into groups when we arrived, those going back to nature, those sticking with technology, those starting a religion worshipping life, and everyone aggreed to be genetically engeneered to try and make life work successfully, Atlantis, Egypt, cavemen and the Inca etc started, when the cavemen and Egyptions started technology etc again the Atlantians left for another planet, destroying all their stuff. Thus, we are a plague. I, personally, prefer thinking we are meant to be here, at one with all other life. Happy!