What strategy does C40 employ to combat urban heat islands?

C40 employs the strategy of implementing green roofs and urban cooling strategies to combat urban heat islands effectively. This approach focuses on increasing the amount of greenery in urban environments, which helps provide shade and cool the surrounding air through processes like evapotranspiration. Green roofs can reduce the heat retained by buildings, lower energy consumption for cooling, and improve overall urban biodiversity. By incorporating more green spaces and cooling strategies, cities can mitigate the heat produced by concrete and asphalt surfaces, leading to a more sustainable and comfortable urban living environment.