Nations and NGOs are doing this. Many are working very hard to spread contraception and reproductive hygiene. The growth has been significantly curbed by this e

Nations and NGOs are doing this. Many are working very hard to spread contraception and reproductive hygiene. The growth has been significantly curbed by this effort with peak population estimates being revised down several times. But many societies have difficult to breach social norms regarding even talking about sex. social norms are very hard to change and we've made amazing progress in just a century. But it's possible we've reached something like a hard limit on how quickly we can change people's beliefs. I for one haven't heard of any new revolutionary psychology that will help move this along faster. We have to tackle this problem from all sides.