Already in place where humans have fossil fuel dependent affluence ... Western Europe and Anglo-America are good examples of wealth keeping fertility rates below replacement ... and China is successful today at keeping her fertility rates equal to Europe/NA ... India gets a pass, that Ganges River Valley has been the densest population for a very, very long time ...
It's in Africa we need to start installing diesel generators and pour cement ... this is where we're averaging up to 5 children per family, and this is for basic survival, young children working sunup to sundown just to feed the family ... where just basic refrigeration and a hot plate in each hut is the difference to baby girls and boys getting to go to school or not ...
Who cares if this is carbon intensive? ... there's a humanitarian question to answer first ... just a few trillion dollars and we can electrify the whole continent and they too can enjoy American TV ... and buy American goods ... there's profit providing First World solutions to Third World countries ... what could go wrong? ...