Gazette: As CEnO of the third largest city in the United States, Sadhu Johnston is responsible for implementing Mayor Richard M. Daley’s environmental initiatives across city government. “My role is to bring the department of environment into each department,” Johnston, who is also the mayor’s deputy chief of staff, has said of his job. Similarly, in Calgary, the role of spurring environmental action across city government belongs to Dave Day, the city’s director of environmental and …