This well received book, informed by its interdisciplinary framework, succinctly yet accurately traverses and illuminates the full gamut of international environmental issues, laws and policies challenging the world today. The fifth edition responds to important developments arising subsequent to the fourth edition, relating, inter alia, to sustainable development, climate change, and energy. These developments include the Sustainable Development Goals (SDGs) of 2015, the 2015 Paris Agreement on Climate Change that replaced the Kyoto Protocol, and the challenges posed by renewable energy and global poverty. In sum, the book offers an insightful analysis of the relevant treaties, customary law, and soft law instruments governing all areas of international environmental law.