While the formation of higher education institution (HEI) alliances is usually driven by purposes of internationalization, the European Union has recently turned to HEI alliances as problem solving tools for societal challenges. The formation of HEI alliances and their missions result from the complex interplay of multiple levels, actors, and issues and notably depend on the political agenda of their source of funding. Since the combat against climate change is assuming a central role in political agendas at (sub)national and supranational level, it is expected to also shape the logics of HEI alliance formation. This contribution asks how HEI alliances are affected by the impetus for a stronger contribution by HEIs to tackle climate change. The analysis investigates the role of climate change for the missions and cooperation results of HEI alliances in the European Education Area. In terms of missions, the chapter finds that HEI alliances cooperate in climate issues due to the profiles of the involved HEIs and due to societal demands and funding stipulations. Regarding cooperation results, the analysis shows that HEI alliances primarily incorporate climate change action into short-term joint teaching formats and into the exchange of researchers with shared interests. Moreover, HEI alliances serve to exchange practices to make campuses and different aspects of university life such as student mobility more sustainable.