Earlier quoted context omitted.
We’re not even close.
Do you believe all 8 billion people could live like Americans in a sustainable way? Do you believe we could produce enough meat and animal derived products in a morally sustainable way? Looking at film of the conditions of the animals in factory farms it’s clear the meat portion of our food supply is grossly immoral.
You are discounting civilizations ability to adapt and invent by an absolutely incredible margin that is not supported by our own history of human events.