UNESCO's Man and the Biosphere (MAB) Program aims to establish a scientific basis for improving human-nature relations on a global scale. After almost 50 years of existence, the most tangible expression of MAB is a network of biosphere reserves, one of whose main objectives is education. Since environmental education (EE) sets out to harmonize the relations between person-society-environment, we have carried out a critical analysis of the actions suggested for this purpose by the MAB. This exercise was carried out as part of the 3rd periodic review of the Mont Saint-Hilaire Biosphere Reserve (RBMSH), in compliance with the Statutory Framework of Biosphere Reserves and with the intention of providing insights into EE practices. In summary, we present five observations concerning the aims of EE, the non-formal framework in which EE is conducted, the axiology of practices, the relevance of developing an EE framework model, and the adoption of formative evaluation approaches during periodic reviews to take into account the diversity of human-biosphere relations within the RBMSH and the World Network of Biosphere Reserves.