Protomech, you are correct that in many places electric cars are responsible for more CO2 than a really efficient gas car. That's one reason there is room for electric motorcycles in a carbon-limited future -- our zeros use something like 1/5 of the KWH per mile as a leaf.
Also, if there is such a thing as a zero carbon future, it is probably going to be largely electric. While we currently burn lots of coal to generate electricity, at least we have existing renewable technologies (solar and wind) that at least theoretically can cover our energy needs. There is a recent study out of Stanford that even a cold, not-so sunny or windy state like NY could achieve 100% renewable energy by 2030 if it developed all the wind and solar potential in the state.
http://news.stanford.edu/news/2013/march/new-york-energy-031213.htmlThis study assumes that all vehicles sold in NY would have to be electric, starting sometime around 2020.
I am not saying I think we are going to get there. But IF we do, its going to be a largely electric future, with liquid fuels reserved for long haul freight transport, not for personal transportation.
--Karl