My husband and I recently spent 5 days in Phoenix visiting our daughter and son in law, who live in a residential neighborhood in Phoenix.  Phoenix is a sprawling and vast city, and Phoenix and the surrounding suburbs and neighborhoods span over 520 square miles. The Phoenix metropolis area is one of the largest cities in the United States,  and the Phoenix metropolis has come up with a genius system & recycling method for the trash and unwanted items produced by the over 5 million people who live there.  I tell of my first hand experience watching how this system operates over a one week period. It's genius!