Climate change is a defining threat to peace and security in the 21st century – its impacts are felt by everyone, but not equally. Gender norms and power dynamics shape how women and men of different backgrounds experience or contribute to insecurity in a changing climate. Grounded in a series of case studies from research and programming experience, this report offers a comprehensive framework for understanding how gender, climate and security are inextricably linked. The report assesses entry points for integrated action across existing global agendas and suggests concrete recommendations for how policymakers, development practitioners and donors can advance three inter-related goals: peace and security, climate action and gender equality.