The review of recent publications in journals specializing in the environmental psychology (EP) field, such as Environment and Behavior and Journal of Environmental Psychology, reflect the prevalence of the positivist paradigm and quantitative methodology in the study of and approach to the topics proper to the discipline. This is noteworthy in view of the formulation of alternative approaches developed from the EP standpoint in an attempt to overcome that paradigm's limitations. Considering the magnitude of the environmental problem and the existence of approaches which, from our point of view, can help overcome those problems, as well as build up theoretical knowledge relevant thereto, we argue in this study in favor of the use PAR. PAR is a perspective rarely applied in our discipline, but which we consider useful to understand and take action regarding human environmental issues. The argument in favor of this perspective reflects the conception of reality on which it rests, and hence, its conception of human-environment transactions, knowledge, social action, the relations between researchers and research subjects, and the purpose of research, among other factors. We then go on to address the definitions, characteristics, and overall guidelines for PAR and its relevance to EP. Finally, we present an example illustrating the advantages of PAR's application, not only for the solution of environmental problems but also for the construction of knowledge, the strengthening and training of the participants, and the promotion of their well-being.