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Virtually eliminated. The most likely electrically driven cars will be from hydrogen/solar. Solar cells WILL be getting better. A huge bump in federal funding will see it happen faster. Then we can use solar power to concentrate the hydrogen exclusively. There, virtually clean source of energy. Using coal and oil power plants 'now' for the hydrogen at the very least allows us to turn the pollution from cars into a point source, which is something that can be controlled and cleaned up much easier and cheaper.
Volcano's and other naturally occurring events are the primary sources of CO2 but they release their CO2 all at once. One big dump and that dump falls out of the atmosphere relatively quickly (planetary scale) because it is so concentrated in one place.
Humans on the other hand produce a constant stream of CO2 that is well dispersed over the planet. The other part of that problem is the loss of carbon sinks, by various means.
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