Meat does use up a lot of resources, that's not much of an argument. But if everyone was a vegetarian, there would be a higher demand for such foods and overall we'd be using around the same amount of resources we've been using to feed livestock. So I don't think that's a very good argument at all.
Eating grass really would be the only alternative, and I don't even think the most obsessed vegans would be very fond of that idea.
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