It also depends on how the batteries are manufactured. It is very dirty to manufacture that many lithium batteries. Manufacture has a much more significant environmental impact than the the source of electricity. Currently, an electric car is more damaging for the environment than a gasoline car when you look at their whole life cycle.
I am still in favour of electric cars. As our technology gets more efficient the cars will become more environmentally friendly. Batteries have come a very long way in the last decade (remember cell phones from ten years ago?). Electric motors are also getting a lot more efficient.
If we always compared new technology to established and efficient technology, we would all be riding around in aerodynamic horse carriages.
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