[LinXitoW]

Well, carbon sequestration, for example. Or habitat restoration. Or more suburbs, or whatever.

It's not just land use, it's every single vector of comparison, like water use, energy use, human labor (ab)use, habitat destruction, etc.

[xtian]

We could cut down on oxygen use by not breathing too. Ultimately you have to ground these abstract vectors of comparison in some fundamental purpose. For me, the only possible ground is humanity.

If humanity is the ground of your analysis, meat consumption will fail to present itself as the decisive factor for any vector of comparison. The decisive factor will generally be the elevation of capital or oligarchic social ends over general social interest.