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This chapter is in line with the strand of literature on urban environmental stewardship and examines how cities around the world have been teaming up with each other in order to foster cocreation and codeployment of nature-based solutions (NBS) to tackle global environmental challenges and promote climate-resilient communities. This chapter describes such an effort that cities made to build international alliances and networks as a new wave of “city diplomacy.” Indeed, recent environmental negotiations at the global level on sustainable development and climate change have proven how cities of different size, with diverse socioeconomic and environmental conditions, were able to put NBS on the agenda and show their transformative power for the common good. Throughout the chapter, the European policy context is always placed at the meso level, between the macro (international arena) and the micro (city) dimensions, in order to demonstrate how the European Union has been instrumental in connecting the global, regional, and local agendas on NBS for renaturing cities.