My argument for that is: Why not create urban farms that are like parks, on public land? There actually is a park that I see as a model: Dover Street Park in Oakland. They took this park that has swings and playground-type things and turned it into a farm. There's not chickens, just annual vegetables interspersed with fruit trees. And it's super cool because you see people playing with their kids and then they go pick raspberries and some greens for dinner.