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There are many sources for electricity being lower carbon output, even with today's mix of coal generation -- because remember, there is a lot more carbon in gasoline that what is physically in it.
According to Nissan, each gallon of gasoline "contains" 7.5kWh of electricity, which could be used to drive 30-60 miles if used directly in an EV. So, the gallon of gas also contains the carbon that is in that electricity -- which means that by definition, the gasoline has far more carbon in it. And there is a fair bit of natural gas used at various stages to make gasoline.
Jim, I was in many physics courses in college, and I have a very good handle on the basics.
Mike -- I mentioned biodiesel as a renewable fuel. But, so far, solar and wind, geothermal, wave, tidal, and methane from digesters and/or plant waste is far more scalable right now.
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