“For the US overall, an electric vehicle is much cleaner than a gasoline vehicle, even when you take into account the emissions from natural gas, coal, or however else you’re generating the electricity,” says Dave Reichmuth, a senior engineer in the nonprofit's clean vehicles program. And as the electric grid moves away from dirty fuel sources, the gap is widening. The UCS study looks beyond driving-related emissions to consider the entire supply chain that goes into making cars go. For the gas guys, that means all the emissions associated with extracting crude oil are included. For electrics, the UCS uses power plant emissions data from the EPA, and includes the environmental cost of mining coal, for example. Because different chunks of the country make power in different ways, the results vary by region.
Look Here: Even More Evidence That Electric Cars Could Save the Planet