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I don't know why it's self-righteous to discuss how meat production harms the planet. I'm vegan- for ethical and environmental reasons. I didn't become vegan so I could feel superior, believe me. That would wear off real quick.
It can be a huge pain trying to find something to order at an American restaurant, and go to your local supermarket and look for any packaged food that doesn't contain chicken stock or a milk product. I spend a lot of money on food and I gave up things I grew up with that I missed at first. Again, no one chooses this lifestyle because of you. It's not about you. It's about realizing that you just can't contribute to an industry that you don't believe in.
Things change. Abolishing slavery had a major impact on the economy and people's lifestyles, but no one would argue that we should have kept doing it because it was tradition. People used animals for food for a long time. The planet can no longer support this practice, period. Deal with it.