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> Similarly, the vast herds of ungulates aren't going away no matter what we do with agriculture, it is a critical and natural part of the North American ecosystem.

You don’t mean the 95 million cattle of the US meat and milk industry? Those are very unnatural, and a significant contribution to AGW.

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North America had 60 million bison before they were replaced with cattle. The necessity of having vast herds of large ungulates in western North America to prevent ecosystem collapse is well understood. If we stopped raising cattle, we'd have to replace them with bison, which have a similar footprint.

It may be a smaller herd, but it will be a very large herd nonetheless. That aside, at no point in the foreseeable future will people stop eating meat and dairy, so total elimination is a bit of a moot point.

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