Cities can help nations achieve their Paris Agreement commitment by supporting the implementation of transformational actions to increase the supply of renewable energy, improve building energy efficiency, increase access to affordable, low carbon transport options, and change consumption patterns. Seventy per cent of C40 cities report that they are already experiencing the impacts of climate change. Cities need to adapt and improve their resilience to climate hazards that may impact them, both in the short-term and in future climate change scenarios. Cities are already leading the way with ambitious plans to accelerate action on climate change. With more political will, community support and collaboration, cities can make an even greater contribution to securing a climate safe future.