The facts are clear to the vast majority. More than half of the world’s population lives in urban areas and, by 2050, this might grow to as much as two-thirds of humanity. Cities are now also said to be responsible for as much as 75 per cent of greenhouse-gas emissions. Urban centers indisputably constitute the hinges of the global economy, global information flows, and worldwide mobility of goods and people. These factors have become well-established knowledge in the wider public as much as in academia: With little doubt, we can now comfortably argue that cities and urban issues are extensively overlapping with some of the key areas of concern for international affairs.