The methodologies used in preparing this paper were (i) literature review on non-formal environmental education for adults locally and globally; (ii) collection of secondary data from a compilation of case studies by the Science and Technology Unit; and (iii) collection of primary data from the Environment Protection Department. Out of the 26 case studies conducted under the Science and Technology Unit, in collaboration with Japan International Cooperation Agency (JICA) and World Wide Fund for Nature (WWF) Malaysia, 12 campaigns targeted the general public. In the context of this study, the general public was assumed to be mostly adults as there were also specific campaigns for students that were evaluated.