Are you in California by chance? Because you seem to ignore the fact that large part of already-inhabitated world is unlivable without heating (and, possibly, meat). Canada, Scandinavian countries, Russia, even then Germany and Poland, and as south as Bosnia.
It's as if you were thinking that warm countries becoming unlivable is tragedy, but cold countries becoming unlivable is desired.
I don't know, let's analyze the facts. Do they emit carbon and participate to the destruction of civilization in 2150? Which one is a crime against humanity, staying in cold countries or moving those populations?
Why do we fear carbon emissions? Because climate change will make swaths of planet uninhabitable and/or underwater, forcing people there to move.
Don't tell me your solution is preventively moving half billion people. Isn't that the result you wanted to avoid? What's the principial difference anyway between land becoming uninhabitably hot and land becoming uninhabitably cold (due to lack of heating)? You lose land either way and have to move people from it, worsening situation everywhere else.
Your solution is basically shooting yourself in the foot to avoid gangrene, and the amount of faith you have in such solution is disturbing. Your position is one big reason why climate change deniers exist: because you scare people with your misdirected zeal.
So we need to come back to emissions of 1990 (when they balanced natural absorption), emit a even less for a while, but with 7 billion people, everyone has to emit much less than in 1990.
To preempt any question... I still eat meat and I don't see how I could do without.
Personally I don't think "going back" is viable, we should probably be trying to engineer ourself a new climate. Better than we had pre-industrialization.
Our planet was pretty messed up even before humans came. It was going to snowball.
We had _some_ meat before petrol (when my parents were kids in the 1950s, sundays were special because they had meat, the 18th century won't have been better). And since the start of the industrial revolution, world population has increased about sevenfold.
For us colder northern countries, population didn't change that much since the coming of petrol. Maybe 1,5x increase in all. Definitely not sevenfold.
And I bet those colder northern countries import much of their meat these days, so it's not much use to make this about local matters only.