 Digital urban ecosystems. We are living in the age of cities. Never before have human beings built with such urgency. One of the grand challenges of this century is to build a science of urban ecosystems from a multidisciplinary base. This will help us to achieve sustainable and resilient urbanization. We will be better equipped to combat climate change, stem the tide of migration and overcome resource scarcity. This new science requires us to view a city not as an artifact but as a system of systems and characterize the interrelationships, networks and flows within it. This will enable us to transform our civilization and our planet. We have projects that focus on exactly this. We are following a data-driven approach and using cloud computing, leveraging the Internet of Things, building cognitive systems and helping to shape our future world. Join us on this journey.