As to my knowledge, no. We live in a very interdependent world. Countries need one another to trade goods, for protection, for shared knowledge. To become completely self-sufficient on the outside looks ideal, but interdependence brings with it the responsibility of caring for one another. In the 1930s the world became dangerously close to isolationism. While isolationism is not being completely self-sufficient, it is certainly close to it. Isolationism in the 1930s has been cited by many historians as one of the causes of WWII.
While no fully sustainable city exists there are plans in the works for a fully sustainable city block in Dallas, Texas and Abu Dhabi has plans for a fully sustainable city. These not yet existant areas will be the first steps to larger projects.
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