There’s a great piece on this written by Kaid Benfield, the director of the Sustainable Communities program at the Natural Resources Defense Council, an adjunct professor at the George Washington University School of Law. See http://www.theatlanticcities.com/politics/2013/08/we-need-rethink-our-definition-sustainable-city/6536/ for more.
The piece should also be read in conjunction with the thought provoking piece on ‘Conserver Cities’ by http://sustainablecitiescollective.com/glenn-vowles/169666/creating-conserver-cities Glenn Vowles, Associate Lecturer in Environment at The Open University.
The dramatic shift of the world’s population into urban areas is encouraging citizens, city planners, businesses and governments to start looking at visions of ‘smart’ cities. Impressive infographic: http://postscapes.com/anatomy-of-a-smart-city-full