Earlier quoted context omitted.
And renewables, which you casually dismiss. Solar panels are becoming on par with coal, and there are many other types of renewable energy as well.
I intentionally dismissed them because renewable energy is still a minor percentage of the total power produced in the world. Not counting biomass it is 6% according to http://en.wikipedia.org/wiki/Renewable_energy
Don't forget the "growing rapidly" part. Sure, if we decide not to use renewables, we won't use renewables. But if we do, we will. We're talking about future plans here (in your words, what will power cars in 10 years).