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I fail to see what any part of your post has to do with veganism; it's about organic vegetables and sustainability. Valid concerns, I'm sure, but irrelevant to whether or not veganism helps reduce global warming and other environmental problems. I, for instance, am vegan, and yet none of what you said has relevance to my life (I mostly don't buy organic vegetables, I don't have a garden or a lawn, and I'm not overly concerned with sustainability.) Your post is arguing against a straw man who I guess claimed that a vegan diet was 100% sustainable, but that's irrelevant. The question is whether it's better than a non-vegan diet. Unless your point is that unless we can attain 100% sustainability then we might as well not try to improve at all, in which case even I (who, like I said, am not all that concerned with sustainability) would have to disagree.