<DIV><P>Most of the world&rsquo;s population now live in cities, but despite wide agreement on the core values of sustainable societies, municipalities are so busy solving current problems, they don&rsquo;t have the time or resources to plan effective action for sustainability.</P><P><I>The Key to Sustainable Cities</I> uses the principles of system dynamics to demonstrate how today&rsquo;s problems were yesterday&rsquo;s solutions. The book points to a new approach to city planning that builds on assets as a starting point for cities to develop healthy social, governance, economic, and environmental systems.</P><P><B>Gwendolyn Hallsmith</B> has worked to build sustainable communities for over twenty years as a municipal manager, a regional planning director, and with the Institute for Sustainable Communities. She lives in Marshfield, Vermont.</P></DIV>