Western fertility rates are on average ~2. Development and education in poorer nations - especially for women - also results in declining birthrates.
Interesting side point though: reduced birthrates don't result in any benefits to drug-resistant bacteria though, since a small population can still run high density feedlots which promote them!
Side-note is incorrect. It's a probability game. Going from (hypothetically) 1000 CAFOs to 10 would drop the rate of production by 100x.
Literally nothing about reducing the population density of an area addresses the horrific practices of the meat industry. They would still be a bad idea if there was exactly 1 next to a town of 1000 people, because that town would still be wiped out by drug-resistant bacteria.
We don't need current meat production practices - they're about corporate profit, not long-term efficiency.
Of course, affluence is where most of the problem lies. The difference in environmental impact between a rich human and a poor human is much greater than between a poor human and no human.
Which leads to a more accurate description of the problem: how do you make not destroying the planet more appealing than destroying the planet on an individual level?
http://www.slate.com/articles/technology/future_tense/2013/0...
In my experience, "those people" are indistinguishable from "people who have the same skin colour as me" after a generation or two.
Oh, and here a some studies with, you know, numbers and statistics that bear that out:
Migrant birthrates falling in Germany, study finds -- http://www.thelocal.de/society/20100811-29073.html
"Fertility rates among foreign-born women start to decline relatively soon after they arrive in Canada, and eventually reach those of women who were born in Canada" --http://www.statcan.gc.ca/daily-quotidien/031222/dq031222c-en...