None of us want the foolhardy destruction of our complex civilization and technological society via rapacious environmental collapse. Perhaps, age, current global environmental degradations and cynicism spur my harsh, bleak outlook for a humanity reduced to tribal clearings and campfires. Sadly, I perceive a "glide path" for current humanity ending in a "nose dive" into the uncertainty of a limited extinction possibility. The time frame seems variable. Yes, Evolution is random; could our genus survive; I don't know. Here are my references: "Under a Green Sky" by Peter Ward, "The Ends of The World" by Peter Brannen, and an oldie but goodie software analysis:, "World Dynamics" by Jay Forrester. ...... Now I really need that 2nd cup of coffee and to walk the dog. Great discussion, Thanks.