This book offers a multidisciplinary exploration of how climate change is impacting conflicts, contention, and competition in the world. The volume examines how climate change is creating and exacerbating insecurities for millions of people globally, and how states, inter-governmental bodies, and others are attempting to meet challenges today and in the near and medium term. It shows that climate change insecurity is relevant to a battery of security areas, including warfighting, stabilisation, human security, influence, and resilience and capacity building. The volume provides insights into how climate change has and will impact security at different scales and in different localities, including national and ethnic tensions, food and water security, resource competition, mass displacement, and even the recruitment profiles and operations of violent and extremist organisations. With contributions from pioneering researchers and practitioners, the book discusses shifting operational requirements and responsibilities, and the need for clarity around the size and shape of capacity gaps. In addition to practitioners and policy-makers working in these areas, the book will be of significant interest to researchers and students of defence studies, peace and conflict studies, climate change and environmental security, and International Relations.