This article, based on empirical work by the authors over the past decade, argues that city planners and policy-makers lack an effective future-oriented approach enabling them to comprehend current complexity, anticipate impending change and shape a preferred future condition.Reflecting on more than a dozen recent city futures exercises, three overriding themes emerge: changing values systems will be the single biggest driver over the next thirty years; the forging of shared visions is a prerequisite to strategic city planning; and the nature, force and direction of the various vectors of collaborative leadership by constituent stakeholders will determine the future success or otherwise of city stewardship.The article concludes by calling for the formulation of a Unified Theory for Sustainable Cities by reference to Gaia and the application of a futures oriented approach such as Prospective Through Scenarios.
