Yep, 999... we have seen previous attempts to "limit someone else's over population problem."

ZPG didn't work in a global sense because we are hard-wired to reproduce. It is Nature's way of assuring continuity... but in the 'lower' animals it is self-adjusting. WE seem to think we don't have to play by the same rules. We 'decide' things and invent metaphysical justifications for our own 'beingness'.

What's left? *shrug* .. universal, random contraception. 'X'% of 12 year old girls get an implant... which may or may not be a real contraceptive. (It is much easier to deal with a few eggs than billions of sperm)

Yes..I see ALL the problems with trying a program like that...and no, I don't believe it will happen... at least not in my lifetime. When we HAVE 14 billion people...*shrug*. who knows what people will be willing to accept.