The environment and its sustainability are increasingly topics of public interest, political debate, and legislation across the world. Several environmental education journals now publish research from a wide variety of methodological traditions that show linkages between the environment, health, development, and education. Therefore, this is an opportune time to review and consolidate the knowledge base of the environmental education (EE) field.The purpose of this 50-chapter handbook is not only to illuminate the most important concepts, findings and theories that have been developed by EE research, but to also critically examine the historical progression of the field, its current debates and controversies, what is still missing from the EE research agenda, and where that agenda might be headed.