Nuts would be completely new plant, never been present in local ecosystem. The idea that this is somehow supposed to be environmental is absurd.

And no, cows where I live don't take 75% of the fields. And people here do drink quite a lot of milk, most of it local. Maybe elsewhere cows they do take huge amount of space, but not here.

Also, quite a lot of what is pasture is a place unsuitable for crops. That is why it is used for pasture.