Except your electricity has to come from somewhere. If you are in the US, it will most likely be from some kind of hydrocarbon. You are just hiding the pollution, not removing it.
By the way, "a growing percentage of renewable over the past decade" is disingenuous. From ~9% renewable in 2002 to ~13% in 2013 is "a growing percentage", but not enough to make a difference in the discussion. https://en.wikipedia.org/wiki/Renewable_energy_in_the_United...
This is not green (electric) VS pollution (hydrocarbon). It's hydrocarbon -> electric -> car instead of hydrocarbon -> car. It's modifying a whole distribution network in the hope of achieving higher efficiency.