The European Green Deal has made the environment and climate change the focus of EU action. Indeed, climate change impacts are already increasing the pressure on states and societies; however, it is not yet clear how the EU can engage on climate security and environmental peacemaking. In this light, and in the run-up to the German EU Council Presidency, adelphi and its partners are organising a roundtable series on “Climate, environment, peace: Priorities for EU external action in the decade ahead”.