From the founding of ancient empires to the challenges of this new century, urban areas have faced innumerable challenges to their survival and growth. This session, moderated by Princeton University Provost Christopher Eisgruber, will cap three days of Forum discussion by pulling together the threads from previous sessions to forge recommendations for governments, urban planners, architects and others concerned about the fate of the world's cities. Panelists include Ariella Masboungi, Ministry of Ecology, France; and Ye Qi of Tsinghua University, director of Climate Policy Initiative Beijing.