Grow produce on the roof or behind grocery stores.

https://greencitygrowers.com/pressclips/whole-foods-market-will-grow-produce-on-roof/

A rooftop garden on top of a grocery store. Brilliant. 

A vertical farm behind a grocery store. Brilliant. So many savings in pollution, water, transportation.

https://www.grocerydive.com/news/grocery--h-e-b-turns-to-vertical-farming-to-freshen-up-its-store-grown-produce/535218/