The United Nations has set in motion a process to discuss and potentially reach agreement on a Global Pact for the Environment. This book informs those discussions, providing a deep dive into the challenges that characterize international environmental law today as well as the necessary background on the past five decades during which these frameworks were created. The book also describes contemporary negotiations about how, and even whether, to clarify and strengthen the norms that guide us today. By providing a clear picture of the competing trajectories of the current state of the law and our environment, this book equips readers with the knowledge and confidence to shape the future evolution of international environmental law.