Electric cars can only be green if they are powerd by green energy. If the electricity is produced by fossil fuels, they are potential worse than "gas" cars. Burning coal, oil or gas in a pwer station is essentially the same chemistry as burning gas in a car engine. Older coal stations are 30% efficient, newer natural gas stations nearer 45%. Modern cars, are around 35% efficient, diesels nearer 40%. Factor in 5% transmission losses for electricity , and it doesn't add up for electric cars using non green electric.