Wasn’t there a panic in the 70s that the world was going to have overpopulated itself to death by now?
However, this chap may have a point. Between then and now, we mostly had the benefit of conservative policies in the mover and shaker nations. Now we may only get liberal throw-up-your-hands-in-despair la la land. And man will be back to living in caves.
Yes, there was clearly going to be mass starvation by the 1980s according to Paul Ehrlich(sp?) in his book The Population Bomb. (He was spectacularly wrong in his projections, every one of them if I'm not mistaken.)