Cities are main drivers of climate action. The relevance of urban areas for mitigation and adaptation cannot be underestimated and yet, the challenges they face are daunting. John de Boer, Managing Director of the The SecDev Group, shares positive examples of cities, such as New York and Medellin, which dealt with Hurricane Katrina and homicides in the best possible way. He argues that we need out-of-the-box thinking to respond to urgent climate risks.