I don't think that it's useless to consider the differences in sustainability between the two. To my mind it is likely that, whatever measures are taken to increase sustainability will not affect the inherent difference between a high-meat and lacto diet, in terms of sustainability. Thus, in relative terms, we are still confronted with the issue of "higher cost to the environment but higher benefit to individuals" vs. "higher cost to individuals but lower cost to the environment"
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