Children of Men
Couldn't find a thread on this but I'm sure others have also thought as the premise behind Utopia serving as a reason behind the world-wide sterilisation in Children of Men.
It seems strange to me that Milner wouldn't foresee any of the massive social problems resulting from most of the worlds population not being able to reproduce. She seems so vehemently intent on this plan that over the course of thirty years she hasn't considered not only this but also many studies which are saying that the worlds population will plateau at 9 billion by around 2050, when the poorer countries begin to urbanise etc.
Also I think anyone seriously considering this problem will realise, especially from a first-world perspective, that we really do have enough food, it's just not getting to everyone. Also even China is going to experience a population shrink, in fact it already before the one-child policy was enacted.
Went a little off point there, but wondering what others think..