Great discussion Lillian. Did you notice that scientists now conclude that the Mayans did NOT collapse. Cheers for clarifying what our collapse might entail. Given nonlinear dynamics we should appreciate that it could happen in the blink of the eye, made more fragile by financial skullbuggery (my word). Here is my take: https://medium.com/@daneke/collapse-american-style-the-political-economy-of-societal-suicide-69a578b73b27