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Fair points. I was noting that if we need to produce X amount of food to feed a population (and that's a discussion in itself) and we remove meat from their diet, it's not always the case that land previously used for meat production can be arable farmed to fill the resulting calorie/protein deficit. We'd then have to find new arable land, which might itself require clearing woodland. Even arable farming is not without impact for biodiversity and habitat loss.
ffm
But those hillsides used to be wooded, and the felling of those trees to provide pasture contributes to soil erosion, reduction in biodiversity, and isn't terribly sustainable etc etc. There are problems however you look at it, but then that's why we're talking about a wholesale reduction in meat consumption.