"katy" wrote
So...discounting immigration, the us, GB, and Europe have all
achieved zero population, and in some places have a negative birth
rate in the middle class up. ....

I didn't know that was the case in the USA. Could you cite a source?

So who decides who does and doesn't get to have babies?

I suggest letting economics decide. Give each person two "chits" allowing them
to father or give birth to two babies. If one didn't want children before
having them, one could sell his/her chit(s) (on eBay grin) at whatever the
market would bear. Similarly one wanting more than two kids could buy chits.
This would allow young people to sell to, say, finance their education or a
house, then buy when they could better afford kids. It's all very democratic and
fair to everybody.

And who do you commit genocide on? Africa? They're doing a really
good job already on themselves.

I'm not going to kill anybody. I'd let God do it! As you say, it would be
unnecessary to commit genocide. All we have to do is quit helping the poor
breed like roaches and mother nature will limit their population.

... China? They've been committed to
that for years and yet they could still physically engulf the US
with population alone.

They have their own solutions and don't need any intervention.

Who's going to enforce world legislation?

God. As you said, most developed countries are limiting their indigineous
populations already and there is a huge backlash building against immigration
from the "third world". If these countries, including the USA and China, simply
close our borders and simultaniously quit paying other countries to over
populate, the problem in those countries will solve itself just as it is in
regions of Africa. When Rhodesia was governed by Europeans it more than fed
itself but now as Zimbabwe, it does not.

And when a pandemic hits, and wipes out millions, who will be the
replacement stock?

Why the people of the developed countries who have vaccines and medicines of
course - vaccines and medicines they do not share. And there is no need to
hurry - the world could do without a few millions.