This thematic review analysed 74 projects supported by the United Nations Secretary-General’s Peacebuilding Fund that responded to climate-security issues or took up other forms of environmental peacebuilding in 33 countries over the last six years. Analysis of these projects and other emerging practice offers insights into how to address a range of climate-security challenges, with particular attention to cross-border and transnational approaches to climate-security programming, the links between climate change adaptation and peacebuilding, and the nexus between gender, climate and security. The findings suggest that local level engagement on climate-security and peacebuilding may be one of the most innovative and tractable ways for making progress on a range of peacebuilding goals.