Urban, demographic and climate trends are increasingly exposing cities to risks of having too little, too much and too polluted water. Facing these challenges requires robust public policies and sound governance frameworks to co-ordinate across multiple scales, authorities, and policy domains....

With two thirds of the world’s population projected to live in urban areas by the middle of this century, the accelerating pace of urbanisation generates crucial opportunities and challenges for sustainable development that reach far beyond city boundaries. Many global processes have...