2017 has been one of the warmest years and has been marked by many natural disasters across continents. “We cannot overcome these disasters with words,” say Karl-Heinz Lambertz, President, European Committee of the Regions. Soon it will be difficult to explain why we did not do more. We need actions and not words. 90 percent of climate mitigation measures will be carried out by cities and regions – every day local authorities implement concrete initiatives in the energy, mobility and building sectors. Cities have to resume responsibility as central protagonists who need to push for more ambitious action by national governments.