There are other benefits as well...

1. Grow almost any fruit, vegetable or grain.
2. Gives new purpose to commercial real estate that is vacant or will become vacant.
3. Less environmental impact reducing need for produce to be trucked into urban centers.
4. Related to the point above, reduces traffic in and out of the cities.
5. More business creation.
6. Faster farm-to-table cycle.
7. Possibly reduces need for preservatives.