Abstract: This article provides a case of school-based research and development of environmental education. In collaboration with an external researcher, four teachers from a secondary agricultural school used an action research model in critically examining their own teaching practice and materials with the intention of developing the environmental dimension of their teaching. Jointly they became engaged in a process of problematising their own teaching practice, analysing a key issue of mutual concern, generating potential solutions, confronting the selected solution with the everyday practice of teaching and evaluating the residts. The research and development process, some of the main outcomes and their potential implications for environmental education are presented.