The Sage Handbook of Eco-Social Policy and Politics offers a bold and timely rethinking of how public policies and political action can address ecological challenges while simultaneously advancing a broad range of social goals—such as equity, wellbeing, inclusion, and democratic participation—through an integrated and transformative approach. Moving beyond the traditional silos of environmental protection and social welfare, this handbook presents a comprehensive framework for understanding how ecological and social justice are deeply interconnected—and must be tackled together. At the heart of eco-social thinking is the recognition that sustainability cannot be achieved without justice, nor justice without sustainability. From the uneven impacts of climate change to the structural inequalities embedded in environmental harm, this volume explores how power, politics, and policy shape our responses to ecological crises. It brings together leading scholars and practitioners from around the world to examine the theoretical foundations, political struggles, policy innovations, and transformative movements that define the eco-social landscape. Structured into five thematic sections, the handbook begins with key theories, informing concepts and histories, then moves through political dynamics, policy design, grassroots activism, and future visions for eco-social transformation. It offers critical insights into how welfare systems, governance structures, and social movements can be reimagined to support both people and the planet. The Sage Handbook of Eco-Social Policy and Politics is an essential resource for anyone seeking to understand and shape a just and sustainable future. Section One: Theories, Concepts, and HistoriesSection Two: Politics of Eco-Social CrisesSection Three: Eco-Social PolicySection Four: Eco-Social Movements, Resistance, and ActivismSection Five: Eco-Social Futures and Transformations