[T-nex]

Well then as I said.. look into the Chinese one-child-only policy...
They've been having this for some time, and you could probably read about the progress and such by googling around for a bit. That's pretty much how the whole world will be if it's put into action.

I dunno if I'd mind restricting the number of kids one can have at a time... But that's just me. I just don't think forbidding children all together is a good solution.

Edit: anyway that's my world-efficient voice speaking... My freedom-to-choose side is alerted by these suggestions.