Navigating the Souring Seas explores how ocean acidification (OA)-a significant yet under-governed environmental threat-is being addressed on the global stage. Bridging science, law, and international policy, this interdisciplinary book introduces global experimentalist governance as an innovative and adaptable framework for tackling complex and uncertain issues like OA. It provides a clear overview of the scientific background of OA and maps the international governance landscape, identifying it as a regime complex. Through detailed interview-based case studies of the Ocean Acidification Alliance and the International Maritime Organization, the book evaluates real-world efforts to govern OA and highlights how experimentalist features, such as flexibility, learning, and multilevel collaboration, can enhance their effectiveness. Accessible and timely, this book is essential reading for scholars, students, policymakers, and environmental practitioners seeking practical, forward-looking governance strategies for ocean and climate challenges. It offers both theoretical insight and concrete recommendations for improving global environmental governance.