Mandy Mahoney, Director of Sustainability for the city of Atlanta. Mahoney says that Atlanta is a progressive, green-minded city that is really turning heads nationwide. Among several intitiatives currently underway, the city is focusing on ramping up its energy efficiency. Mandy Mahoney, Director of Sustainability for the city of Atlanta. Mahoney says that Atlanta is a progressive, green-minded city that is really turning heads nationwide. Among several intitiatives currently underway, the city is focusing on ramping up its energy efficiency.