After they cut down the last tree, they lost their ability to fish, had no friendly neighbors to whom to turn for help, had nowhere to which to escape, so they starved to near extinction. The example of Easter Island attracted the most interest, he said, for its similarities to Earth: we are isolated in this universe and have nowhere/nobody to turn to if we are careless in managing our resources and end up depleting them. He concluded by reminding us to remember above all else the number 32 -- i.e., the number of times of resources that first world nations consume over third world nations.
The topic of tonight's talk was his thoughts since writing Collapse comparing individual and society survival of crises. Drawing on his wife's clinical psychology background, he began talking about coping factors that enable crises victims to and survive. These were: the ability to fence in a problem and tackle it while preserving what's not problematic outside it, I guess, like compartmentalizing; "ego strength" or self-confidence/self-love, which he likened to cultural pride and preservation on the societal scale; flexibility/rigidity in adapting to deal with crises; exposure to of alternative models of coping or something like that; the ability to reappraise one's core values in order to cope with a crises; and a bunch of others in between that I can't remember. He interspersed societal examples rather than analyzing them systematically under these factors -- for instance, marveling at how a tribe of Papua New Guinea in first learning the existence of helicopters asked all sorts of questions about them, then quickly decided to charter their own in order to import birds of paradise from elsewhere and sell them in their own villages for a profit, yet maintaining their culture (wearing grass skirts) throughout. As for implications for our own society, he quoted Dick Cheney saying something to the effect that our core values as Americans were nonnegotiable -- implying that we ought to redress our rigidity, unwillingness/inability to adapt if we are to survive future crises.
Whether or not Diamond's approach is novel or earth-shattering, or he is repetitive or long-winded -- some criticisms made of him -- I find his problem-solving approach systematic, useful and applicable to many areas of life. Whether or not he is unique in doing so, I like very much that he puts "us" -- Americans and humankind -- to the same analyses as to societies in history, warning us of some fairly dire implications of our attitudes and behavior now while it is not too late for us to change course and take control of our destiny. Many of us are hard-pressed to think beyond our households, let alone our lifetimes. He would make a great advisor to leaders -- enlightening and shaping our policies to strategize and plan for the long-term -- alas, if only they would listen.