The "Green Roof Strategy" (2005-2007) is an initiative of the city of Basel in Switzerland with the main aim to increase the coverage of green roofs in Basel through the use of a combination of financial incentives and building regulations. The instrument is the successor of an earlier initiative that provided subsidies for the installation of green roofs between 1996 and 1997. As a nature-based solution, the green roofs promoted by this policy instrument offer multi-functional benefits for e.g. climate change mitigation (reduced energy consumption of buildings) and adaptation (lower temperatures, reduced surface runoff, etc.), as well as for the protection of biodiversity. The Strategy was supported by an awareness-raising campaign to promote the acceptance of the measures.