The effects of climate change will increasingly shape our security in the coming years. The environment is now in a state of flux, posing significant challenges to how societies function. This may have serious economic, social and political consequences for entire regions. adelphi and its partners formed an alliance with the German Federal Foreign Office and have played a central role in the process of analysing the international debates on climate diplomacy and security, while developing key narratives, contributing to awareness raising and capacity building efforts, and supporting international and regional dialogues on this topic around the world. In this publication, we seek to illustrate the rationale and results of adelphi’s engagement in climate diplomacy activities – efforts undertaken to help foster a response to climate change that is commensurate with its status as one of the key foreign policy challenges of the 21st century.