I don't dismiss the idea that we are past sustainable limits already. But the fact is that increased living standards have not caused commodities crunches yet.

I don't dismiss the idea that we are past sustainable limits already. But the fact is that increased living standards have not caused commodities crunches yet. Also, stabilizing population is the first step toward a sustainable population level, no matter what the right number is for a world that thinks in terms of a "long now."