Cities Self-Reliant for Food?

In a world of growing food supply perils -- droughts, floods, broken global supply chains -- can individual cities identify routes to food self-sufficiency (or at least reduced dependence)?  Given modern cities’ immense reliance on outside supplies, self-sufficiency is a long reach.  But urban food production is increasing.  And one study projects Cleveland could theoretically to meet up to 100 percent of its fresh produce need.  Economic translation: $115 million in fewer regionally “leaked” dollars.