KiwiNZ: There is already population control. The economics of having a family has resulted in smaller families to the point that in many countries their birth rate is not sufficient to maintain population. NZ is close to that, remove migration out of the population growth stats and it will show we will be close to zero growth.
Western countries perhaps, but those western countries demand goods that get made in countries who's populations are sprawling and are quite happy to rape,burn and pillage mother earth to make themselves wealthy and provide westerners with their gadgets and shiney things.