I feel that CO2 could more easily trigger the Earth's more delicate tipping points like if the tundra melts, the ground is darker and will absorb more heat and release more stored CO2 in the process.
I think the biggest answer to CO2 is changing the power plants to burn with clean coal technologies rather than how they work now. The cars will need more of a long term solution. We need to get to a point where dependence on the Middle East is a distant memory. If solar could be improved, cars covered with cells sitting in a parking lot all day could get a portion of their power for startup or acceleration that way. Producing and wiring them needs to be as simple as a new paint job for that to take hold though. For electrics to really work, they also need a backup power source too. If you could make it to work and back without using the backup source and paying for fuel, you would probably tend to change your driving habits to fit those types of trips.
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Boone Titanium Rings