Although I mostly agree with you, what are some examples of economies that suffered as a result of overpopulation? China and India seem to be doing fine. I mean, it seems obvious that the wave has to break but I just don't think we've seen it happen yet so it's hard to predict. (Not a history buff so maybe I'm missing something obvious.)

"Population ponzi" ? I suppose the welfare state could be described that way.

People necessarily produce more than they consume in order to survive. Almost all people produce wealth greater than that required for bare survival. Population growth necessarily means higher wealth and standard of living for everyone. Welfare schemes (for rich and poor) turn this on its head. Thus population becomes a problem, because a greater and greater portion of the people are producing nothing.

The only thing worse than a rising population is a falling population.

The first time I've heard that term. Catchy soundbite -- useful as such.