Research related to environmental education has consistently indicated that many students and young adults attribute a large amount of their knowledge of environmental concepts, problems, and issues to out-of-school (non-formal) educational settings and experiences. Data also indicate that students and young adults attribute much of their attitudes and values to similar experiences. This digest discusses out-of-school settings and experiences related to environmental education; effective strategies for teaching concepts; issue awareness in out-of-school environmental education; and trends in out-of-school environmental education. A list of ten selected references is included. (CW)