In 1970, the Club of Rome ran nine (I think) different computer models of what might occur if growth was not checked. ALL the models came up with the same conclusion: within 100 years (of 1970), world population would collapse. Here we are, 40% of the way through this century, and we are bang on target for a collapse beginning 2025~2030.
Peak Oil, Peak Water, Peak Phosphorus, Peak Debt and Climate Change are all marching on their way to making it all come true.
http://damnthematrix.wordpress.com/2012/04/11/so-much-for-debunking-the-club-of-rome/