1. Mapping the ‘Anthropocentric-Ecocentric’ Dualism in the History of American Presidency: the Good, the Bad, and the Ambivalent Bakari, Mohamed El-Kamel 2017 Articles Environmental policySustainable development--Political aspectsSustainable development--Government policyPresidentsSustainable developmentPublic policy (Law)Reagan, RonaldRoosevelt, Theodore, 1858-1919Obama, Barack