There's an important thing though... Let's assume the world could carry 20 billion vegetarians, and think about what would happen if everyone in the world instantly turned into a vegetarian.
Here's my guess: we'd start procreating more and more until we hit that limit, and then a die-off would occur anyway. In absolute terms, saving food might cause more suffering, not less (it would just postpone it).
In other words... are humans smarter than yeast? So far it doesn't seem so, at least not regarding sustainability.
That's why I don't fret too much about my hypocrisy (although I do avoid using cars and try to save energy as I can). If humans as a whole aren't smarter than yeast, I might as well enjoy my meat.
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