Environmental education can deliver benefits to individuals, society and the environment, but few studies have asked practitioners or participants what they feel these benefits are. This research compares the perspectives of practitioners and participants in environmental education projects, using questionnaires, focus groups and participant observation. Practitioners and participants listed a large number of outcomes, with increasing knowledge about the environment mentioned most frequently. For participants, this was often in relation to gaining new skills. Social outcomes, such as making new friends, were more prominent in participant than practitioner responses. Practitioners did not spontaneously mention any negative outcomes of environmental education, and few were suggested with prompting. Participants suggested more negative outcomes than practitioners, notably damage to the environment. The differing views suggest a need for greater discussion between practitioners and their participants.