Bruno Romagny is an economist and director of research at the French National Research Institute for Sustainable Development (IRD - Institut de recherche pour le développement), Laboratoire populationenvironnement-développement (LPED), France. Catherine Cibien is director of the French committee of UNESCO's Man and the Biosphere (MAB) Programme. Angela Barthes is a professor at the University of Aix-Marseille, France, and specializes in environmental education and rural development.