> The majority is pasture and forests, which arguably is almost entirely natural. The second largest use is crop land. "Natural" is a black hole for the purpos

> The majority is pasture and forests, which arguably is almost entirely natural. The second largest use is crop land. "Natural" is a black hole for the purpose of debate. Pasture is natural if the number of livestock are controlled, otherwise look out. Monoculture forests (have you driven through the western mountains and seen the beetle damage) have issues. Crop land- a massive issue to consider, if you want to see the impact just surf the satellite views of the US on Google maps, huge swaths of land with not enough "natural" in between. It would take very little proportionally, but significant (impossible?) effort to build in true swaths of "natural" habitat throughout impacted areas.