In our ancestral environment, having a little bit more wouldn't have helped us or hurt us. But if we were in a period where there was hardly any, and then we were already on the edge losing what we did have would have been fatal. So that response of holding on to gains and being reluctant to give things up in our consumption was conserved over evolution time. The problem is that nobody has thought through the end of that bell shaped curve. We are polluting the very planet on which we once had relied to increase our propensity not only living well, but also having lots and lots of kids. That was what the book american mania was all about.

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