Multilateral cooperation initiatives (or “climate clubs”) can generate some of the additional action that is needed to achieve the goals agreed in the Paris Agreement. This paper, produced for the German Federal Environmental Authority (Umweltbundesamt UBA), analysed the state of collaboration in four policy areas: energy transition, synthetic fuels, food systems and forest protection. It identified several possible additional themes and formats for additional initiatives. A number of these are highlighted as particularly promising following specific analyses of opportunities provided in the context of the UNFCCC, the G7 and G20 and through the pro-climate action agenda of the Biden Administration in the US.