This conversation is closed.
Can we sustain the population AND the ecosystem without converting to vegetarianism?
Setting aside the ethical questions about humane treatment of animals and the ethics of killing them if we don't need to (important and interesting questions, mind you), let us consider it just from the standpoint of logistical feasibility.
If you don't think we have reached that level yet, at what point would we? That is, under what conditions would the answer tilt to the negative?