Because of global urbanization, that's a problem the whole world is going to have soon enough. Japan is leading the way and the US is slowly following. But, t

Because of global urbanization, that's a problem the whole world is going to have soon enough. Japan is leading the way and the US is slowly following. But, the trend is that in a hundred years the entire planet will be having sub-replacement birthrate. Yay. The population explosion crisis has accidentally been averted. Oops. Now we have the opposite crisis to deal with instead. Might as well start figuring it out early.