This perceptive work presents a unique comparative legal analysis, ascertaining how regional environmental law can contribute to the prevailing pursuit of global sustainable development. The book provides an introduction to and analysis of the environmental law adhered to by each regional organisation in an accessible and discerning discussion.Regional Environmental Law analyses the manner in which four distinct regional organisations - the European Union (EU), Organization of American States (OAS), Association of Southeast Asian Nations (ASEAN) and the African Union (AU) - facilitate cooperation concerning regional environmental law in order to promote sustainable development. The fundamental environmental issues that require regional cooperation are considered: human rights and the environment, climate change and shared watercourses. Leading scholars critically analyse how states may pool sovereignty, pursuant to finding solutions to these salient environmental problems. The book puts forward conclusive thoughts about how to work towards the sustainable development agenda through both specific regional action and collaborative efforts.Researchers and students interested in international and environmental law will benefit from the comparative analysis of the respective regional organisations and their contribution to the sustainable development commitment. Practitioners and policy makers will find practical insight from the conclusions drawn.