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Electricity is not only 'green' if produced by nuclear plants, but also by wind turbines (popping up in huge numbers in various parts of the world), hydro (think of the Sir Adam Beck plant at Niagara Falls, but also various other smaller hydro-electric plants) and solar (which is becoming more and more prevalent). Furthermore, even when plants use oil to generate electricity, less polution will typically result at peak periods (aka rush-hour) as vehicles are using their stored electricity and recharging at night when there is typically less demand. Over time, as more and more electricity is converted to 'greeen' sources, the difference will become even greater.
At present there are many reasons to prefer gasoline or diesel engines, but contributing to the environment is not one of them.
Brad
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