This is a profitable idea.

I've seeen this before and liked the idea. It can't be denied that the population and the demand for food is both growing.

City mayors/officials can implement policies to support/incentivize new Green projects (aside from current Green prpjects), such as housing complexes with green roofs where homeowners can make communal gardens or they can lease it to farmers as a side income.

Don't know how would that work in the real world, but it's a beautiful idea to implement.

Green Rooftops