When the Limits to Growth study (Meadows et al. 1972) found that humankind was on a trajectory towards overshoot of carrying capacity and population collapse,, one of the most common reactions (e.g., Simon and Kahn 1984) was to dismiss the results of the computer model runs, on the theory that technology would be developed that would forever push all limits off into the future. These Cornucopians proclaimed that population growth was something to celebrate, as every birth represented two new hands and one new mind to work on building a better world. Most of these commentaries took it as an article of faith that political and economic systems would ensure that new generations would get the education they needed and the work assignments neces...