An electric car doesn't remove carbon emmissions, it just remove pollutants from cities, which is not bad of course. The energy and possible pollutants are now produced somewhere else in the country where the energy will be produced and then stored/ transported down the grid.
I have read scientific articles which in fact prove the total carbon/ pollutants footprint for a high powered electric car are actually much higher than a similar petrol powered car. Think about energy efficiency, loses on the grid network and it makes sense why. Also if you add up the cost of batteries going flat while the car sits idle in the driveway cost for electrics goes even higher.