Some folks have asked whether switching from gasoline to electricity really emits less carbon since electricity needs to be generated from some source. Well it does depend where you live. In Vermont we are fortunate to have carbon clean sources of energy, mostly from HydroQuebec. There have been a couple of studies that look at this issue and all seem to conclude that in Vermont, and in most other places, driving an electric vehicle is much better from a carbon emissions perspective.
The Union of Concerned Scientists issued this report: http://www.ucsusa.org/clean_vehicles/smart-transportation-solutions/advanced-vehicle-technologies/electric-cars/emissions-and-charging-costs-electric-cars.html
There’s also this report from the Climate Center: http://www.climatecentral.org/wgts/leafapp/Climate_Friendly_Cars_2012.pdf
Both show that in Vermont driving an EV is much better than an ICE from an emissions perspective.