As levels of urbanization increase around the world, the growing concentrations of population and economic activity increases vulnerability to natural disasters. Interdependencies among urban populations mean that damage to the built environment, including water, sewer and energy infrastructure, can affect millions. Even if there is no change in the rate of occurrence of natural disasters (an unlikely prospect in the face of ongoing climate change) the potential for human and economic loss will continue to increase, along with the time required to recover. How do cities prepare for and...