Book excerpt: This comprehensive Handbook tackles the increasingly urgent problem of the impact of climate change on conflict and human security. It analyses the ways in which scarcity of resources leads to food, water and health insecurities, resulting in population migration. Chapters cover how these contribute globally to societal insecurity and violent conflict in a growing number of regions. Featuring contributions from leading international scholars, the Handbook is divided into thematic sections, examining first the effects of environmental scarcity on security at a macro level before delving into region-specific issues and challenges. The final section investigates the actors, institutions and processes engaged with environmental security, discussing the shifting international political discourse and how this is challenging the conservative military security paradigm. The combination of comparative global analysis alongside regionally focused studies makes this Handbook an invaluable resource for all scholars and students of environment and climate security. It will also be of interest to policy professionals working on issues of environmental scarcity and new security challenges.