While I am sure that the Raw Food movement will vanish, if we do have dark ages 2.0 we'll all be eating local, but it would be very helpful to know what could be grown in your area. I would love to find something like this for the whole world.
Food has been traveling a lot since the invention of the refrigerated steam ship, railroad car and truck.
It boils down to having cheap energy and cheap iron, as most ships, locomotives, railcars and trucks are primarily made from steel. Yes, there is plenty of other stuff in them like plastic but for sheer weight most of it is in steel.
The refrigerated steamships were coal powered, somewhat dirty but very effective, they could be cleaned up with a bit of work.
Personally, I think oil is too useful to waste it by burning it, it is much better to use it in chemical processes for plastics and the like.
When it comes right down to it, the big thing about an advanced civilization is minimizing the number of people growing food and maximizing thinking time for everyone. We waste far too much time on what amounts to busyness.