@jukeboxradio A law is not needed for this. It is well documented that as societies develop people have fewer children. Lesser developed societies value more children to ensure some live to be adults and to help with work that cannot be "outsourced" like in a developed society
@nxnn I think you're taking too global of a perspective. Overpopulation is ALREADY a problem in some areas of the world. Also space to hang your hat isn't the issue - it's resources like fresh water and food.