This study was trying to figure out what would happen if everyone in the US followed the same diet. That's probably not that useful for individual decision making. Even if lots and lots of people became vegan we wouldn't stop using grazing land, we would just raise less grain-fed animals.
Also, this analysis doesn't seem to consider animal suffering, which I personally find important.
If it's worth saying, but not worth its own post, then it goes here.
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