Seventy-nine countries took part in this comparative study of education conducted by the International Bureau of Education and Unesco. The study presents information obtained from these countries in comparative tables and individual narrative reports on each country's efforts in environmental education. Environmental education was defined to embrace essentially all aspects of education, but in this study particular emphasis was on ecology (those courses which deal with the mutual relations between living organisms and their natural environment) and sociology (where pupils became aware of the problems in their area in the process of learning the relationships which exist between all its aspects: physical, social, economic, psychological, cultural, etc.). The questionnaire utilized investigated the aims and place assigned to the study of environment, curricula and syllabuses, methods and techniques, and teaching staff. (DK)