This book shows why a fundamental right to an adequate environment ought to be provided in the constitution of any modern democratic state. This book is the first to examine the question from the perspective of political theory. It explains why the right to an environment adequate for one's health and well-being is a genuine human right, and why it ought to be constitutionalized. It carefully elaborates this case and defends it in closely argued responses to critical challenges. The book provides illustrations from around the world of how human rights and environmental concerns have been linked to date, and highlights precedents for the future development of a fundamental right to an adequate environment. It will be of value to policy-makers, lawyers, campaigners, and citizens concerned with environmental protection as a public interest and fundamental right. It will provide a valuable resource for students and teachers in politics, philosophy, law, environmental studies, and social sciences more generally.