"cull the excess people?"

no...not exactly. But since most of them refuse to limit their breeding habits, someone has to do it for them. The alternative is....(well, have you ever seen too many rats in a lab cage?)

How to do it?...Not easy of course....the sanest, fairest way would be implantable contraception in allgirls under 12, with some implants being placebos, the 'right' number to be determined mathematically. Thus, no one would know for sure whether they would have kids, and never be sure whether it was them or the implant. This would preserve, mostly, the same balance of class and race...etc.

How's that for a plan? Do I think it would have chance in Hades of being adopted? HA!....well, maybe when the population is 14 billion instead of 6 billion. (That's in the next 50 years, folks!....I remember when it was 2 1/2 billion)