Drawing on a variety of disciplines, Sustainable Diplomacy is a highly constructive work. Set in the context of modern Moroccan-Spanish relations, this text is a direct critique of realism as it is practiced in modern diplomacy. Proposing a new eco-centric approach to relations between nation-states and bioregions, Wellman presents the case for Ecological Realism, an undergirding philosophy for conducting a diplomacy which values the role of popular religions, ecological histories, and the consumption and waste patterns of national populations. Sustainable Diplomacy is thus a means of building relations not only between elites but also between people on the ground, as they together face the real possibility of global ecological destruction.