[eloff]

I agree fully, it's absurd to think of wiping out the human race. There is basically no disaster that would leave the Earth intact but wipe us out. We're the most adaptable species the world has ever known and we're everywhere.

I said civilization would collapse in a dire nuclear war scenario, which is not the same thing. Advanced civilization itself may actually be quite fragile - we see glimmers of that fragility now and again when government / order / utilities break down for prolonged periods.