Population growth is slowing way down. Some people are worried about this. But I think it is a good thing. The Earth has some carrying capacity and if we go beyond it people will start starving. That is not fun. Yes, we can engineer a higher carrying capacity as we did during the green revolution. But there are still limits. Population is still growing. It is still growing in the USA. It is still growing in NZ. It is very much still growing in sub-Saharan Africa. Current estimates put the peak at 10 billion. The problem with population contraction that most of you and I will feel is that all the government (and non-government) Ponzi schemes will collapse. Economies will be rubbish, growth will be stalwart. But you can accustom yourself to such times. The idea that we need to start having more babies is misguided. We could push out the inevitable, but we can't avoid it happening eventually.