Urban farming is a helpful addition to modern society.  Have you ever seen any urban farms?
Sure, more like a commercial farmer I suppse
Thats cool.  I really hope more of our cities become sustainable cities in the near future.
So what do you attribute to it?
Are you asking what I consider a sustainable city? 
Not so,just wanted you to tell me more about the style of farming
Ah I see. Essentially it is creating a city in a way that ensures the evironmental impact is sustainable and future generations experience the same level.