This is a big one, and we should aim for rewilding in the reclaimed space. Agriculture is one of the biggest drivers of habitat loss and thus biodiversity loss.

I wish we could properly account for this negative externality. To me the ideal state for every inch of land is it being a wildlife refuge. To that end I'd love to see a tax that gets charged for using land for anything else. I think it would drive a lot of improvements like vertical farming

As a counter example, raising grass-fed cattle on native prairie in Montana is much more "natural" than a wildlife refuge. The natural state of that land was maintained by massive wandering herds of bison. The massive bison herds and their apex predators generally don't exist any more, so a wildlife refuge can be far less "natural" than grazing land.

Wouldn't it be wonderful though if we could reintroduce them?

Are there constrains wrt a given acre of land only receives a fixed average sunlight?