Electric Cars: The reality

I see a few people bring up environment & don`t realize what it takes to process petroleum.The Province of Alberta supplies alot of the petroleum to North America & the ecological damage is just beginning to show.
To process the tar sands they have physically remove the earth from a open pit mine & then taken to be separated so the Petroleum.Theirs evidence that ground water is being poisoned & wildlife/plant life are being effected.
I guess my point is that for a car to pollute it needs gas & it just more then what comes out the tail pipe of the vehicle that the probelm