This book analyses over 20 years of rights-based litigation in the areas of climate change and plastic pollution in order to assess the value of rights in confronting and overcoming planetary crises. We live in an age of planetary crises such as climate change, biodiversity loss, and plastic pollution, which take a huge toll on communities all around the world, endangering their fundamental interests. But can the lack of government action on these crises - or action that worsens them - amount to violations of human rights? Many courts are grappling with this question, as rights-based litigation becomes increasingly common. By focusing on climate change and plastic pollution as case studies, this book examines the viability of rights claims when confronting planetary crises in courts. From early attempts to pursue rights claims in response to planetary crises in the first decade of the 2000s to high-profile court wins in such cases in the 2010s and the spread of such cases across dozens of jurisdictions by the 2020s, rights claims in climate change and plastic pollution litigation have become a truly global phenomenon. Through a systematic and in-depth analysis of such litigation in more than thirty jurisdictions, this book identifies factors that determine the viability of rights claims when confronting planetary crises. It reveals that, even though not all litigation forums are equally favourable to such claims, human rights can indeed be successfully invoked in different types of legal action. This book will be of considerable interest to policymakers and legal scholars and practitioners, as well as students, who work in or study environmental and climate change law, human rights law, constitutional law, and international and comparative law.