Social science theory for environmental sustainability: A practical guide makes social science theory accessible and usable to anyone interested in working toward environmental sustainability at any scale. Environmental problems are, first and foremost, people problems. Without better understandings of the people involved, solutions are often hard to come by. This book answers calls for demonstrating the value of theories from the social sciences for solving these types of problems and provides strategies to facilitate their use. It contains concise summaries of over thirty social science theories and demonstrates how to use them in diverse contexts associated with environmental conflict, conservation, natural resource management, and other environmental sustainability challenges. The practical applications of the theories include persuasive communication, conflict resolution, collaboration, negotiation, enhancing organizational effectiveness, working across cultures, generating collective impact, and building more resilient governance of social-ecological systems. Examples throughout the book and detailed vignettes illustrate how to combine multiple social science theories to develop effective strategies for environmental problem solving. The final chapter draws out key principles for enhancing these efforts. The book will serve as a key reference for environmental professionals, business people, students, scientists, public officials, government employees, aid workers, or any concerned citizen who wants to be better equipped to navigate the social complexities of environmental challenges and make a meaningful impact on any environmental issue.