This book seeks to address two significant gaps related to grassroots climate action: the continuing dominance of the individualisation of responsibility for climate change action, and the potential for community-based collectives to influence mainstream climate change governance. Drawing on empirical research into Australian Climate Action Groups (CAGs) and related international research, the book argues that grassroots community-based collective action on climate change holds the key to broader social change. It will be of great interest to students and scholars of climate change, citizen participation, environmental sociology and sustainable development.