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growing pigs, chickens, and greens in each cities
The pigs would eat the left greens ans provide food to the citizens. I know some of them don't eat pork. chickens eat quite the same. It could be easy to too make fertilizer with the garbages.
Growing pork,chicken and vegetables around the cities, fed with with delete greens could provide very low price food to people, cut the transportation costs and give work to people....It is a dream, I know....