Combine the two: rooftop gardens. Chicago has been pretty successful encouraging the development of green roofs with grants and the like: https://www.cityofchic

Combine the two: rooftop gardens. Chicago has been pretty successful encouraging the development of green roofs with grants and the like: https://www.cityofchicago.org/city/en/depts/dcd/supp_info/sustainable_development.html https://www.cityofchicago.org/city/en/depts/dcd/supp_info/su...