Transportation — trucks, trains, planes and automobiles — is a major source of greenhouse gas emissions in the U.S. Electric vehicles offer a less polluting alternative. That, and reduced fuel costs are strong selling points. Limited battery range is not. But shorter distances, and those savings, work for many local governments. Last month, Savannah added two new electric cars to its city fleet. Nick Deffley is the director of Savannah's Office of Sustainability. He joined On Second Thought from GPB's studio in Savannah to talk about how the city began its transition to electric vehicles.