In the near future, humanity will be challenged by the converging trends of energy depletion and climate change. It will be necessary for us to transition into a culture that consumes drastically less, and to shift away from the paradigm of perpetual material growth.  As part of this transition, the means for securing food, water, energy and waste management must be re-localized into people’s home communities. As currently more than 50 percent of the world’s population lives in urban areas, it will be critical to make our cities more sustainable.

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http://www.motherearthnews.com/nature-and-environment/sustainable-city-living.aspx