Environmental education is a field characterised by a paradox. Few would doubt the urgency and importance of learning to live in sustainable ways, but environmental education holds nowhere near the priority position in formal schooling around the world that this would suggest. This text sets out to find out why this is so. It is divided into six parts: Part 1 is a concise history of the development of environmental education from an international perspective; Part 2 is an overview of the ’global agenda’, or subject knowledge of environmental education; Part 3 introduces perspectives on theory and research in environmental education; Part 4 moves on to practice, and presents an integrated model for planning environmental education programmes; Part 5 brings together invited contributors who talk about environmental education in their own countries – from 15 countries including China, South Africa, Sri Lanka and the USA; Part 6 returns to the core questions of how progress can be made, and how we can maximise the potential of environmental education for the twenty first century.