I think neither the rate the world is populating before either of those we will starve or you'll end up seeing unexplained deaths.
I personally think there should be a cap on populating just for the sake of it e.g if you already have two kids then no more our world can't cope with it look how much we have already grown in the last two years at this rate we will be over run by the time I hit 70.
I think those who selfishly have 5-10children who can't afford them and are living on the dole shouldnt have been allowed to get to that stage especially since some people out there haven't got any children want one and are forced to adopt.
If you want more than2-3kids then help some poor kid who has lost their parent or had to be moved and adopt give them a better life and lots of love.
But that's just what I think just an opinion and quite a small one in the scape of things