Let's see, I didn't make any claim about untouched - although I do have some strong positions on wetlands cover, corridors, wild old forrest, et al but that's a whole other aside.

I'm just here to point out farming and livestock at suprisng to many scales can be operated by fewer people than you might expect.

as for: > no-one can afford to be shipping food halfway round the planet.

what does the Atlas of Economic Complexity type datasets currently say about food volume tonnages and trip lengths? I know that our local farmers co-op

  handles handysize to post-Panamax vessel shipments from Australia, United States, Canada, South America and Europe to key grain markets in Asia, Europe, Central America and the Middle East. 

and there are other grain basins about the globe.

The challenges for grain shipping going forward likely fall about getting sufficient production of non fossil origin methanol fuel variations for shipping engines.

That and making sure the front doesn't fall off.

And yet, farmers still need roads, and hardware stores, and grocery stores, and hospitals, and HVAC and plumbers and before you know it, you need villages for all the people those people depend on, along with their families.