''As people become more well off and have an acceptable standard of living, evidence shows that birth rates tend to drop.''
Yes but that standard of living increase is thanks to burning fossil fuels, so it's going to fall as we are forced to adopt sustainable energy sources.
How do you control religious regimes that promote high birth rates as a means to increase their power?
There will be plenty from third world countries who will be keen to migrate to one of the countries 'suffering' from declining population, to balance the equation.
