A very large fraction of land (~50%) is currently used to grow biomass to feed 8 billion humans. Nothing about that land is 'natural' - it's a carefully engineered environment that's quite hostile to animal life.

The land that people live on, whether it's in a city, a suburb, or in a rural manner is a rounding error compared to those demands.

This only looks at land mammals rather than plant crops, but...

https://xkcd.com/1338/

We could probably reduced cultivated land by 50% if we would stop wanting to eat mid-sized or large animals (cows and pigs).