I am watching the Telsa Model X presentation video (here).
At one point, when Elon Musk argues that electric vehicles produce less CO2 than gasoline vehicles, even when power is generated from fossil fuels, he puts up a map of west Virginia (heavly coal user), which he calls "worst case situation', with comic pauses. The audience laughs. Then comes a map of Vermont, which generates its power from hydroelectric, nuclear, and other cleaner alternatives. Applause.
If I was Elon Musk, I would be a little more humble. The people of West Virginia help to subsidize a $500 million loan to Tesla, to build a plant in Calfornia.