Even if I used enough electricity heating the car to bring to total car energy use down to as inefficient as a gasoline car, all my electricity is STILL from renewable sources.
You CAN make electricity out of thin air - wind, solar, etc. You can't do that with gasoline!
Still, we shouldn't be wasteful with the stuff. I am trying to heat the car as much for safety (no frosted windshield!) and efficiency (warmer batteries run better!) as I am for comfort.
If I was only trying to keep warm, I would just stick with the great down coat I got last winter!
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