How Many People Are You Willing to Lose to Achieve Sustainable Ability?

This is a question that i find interesting, because i fee like it really misunderstands it. The question is of what population can the post capitalist world sustain and thrive on? And ye, are optimistic, with proper technology and eco sustained ability techniques, we can maintain a population close to what we have now. Ah, still no, still no horse. Still have not found an entire horse carcass. Ah, but one day it will happen. You know, it'll happen.