Obviously if someone needs to eat meat to live I'm not going to object. And people living sustainably and not just supporting the animal ag industry are also off the hook in my books.

But in regards to your weird vegetation stuff, I hope you're aware that the livestock are raised on vegetation and will typically consume more calories of feed than they provide with meat? This is a large part of why the Amazon is being deforested, it's to feed livestock, not vegans. The science on how to stop environmental damage is pretty clear on that one.