[setr]

It seems to me the scenario really would like

1. Deforest land, for some purpose at most tangentially related to agriculture (presumably to use the wood)

2. Land becomes fairly useless; find most productive usage possible

3. Animal agriculture / grazing fields

That is, I doubt land is being specifically destroyed for this purpose -- there's enough available land to simply use as-is... unless it's already been destroyed as a byproduct of other activity.