I would say that if and when we run out of petroleum, I believe that we may switch to electricity. Pros: Silent running, somewhat an endless supply of energy. Cons: Low mileage (I rode a golf cart, and either the low mileage is due to electricity running it or the golf cart wasn't programmed to go to higher mileage due to shorter battery life span.), nothing really else besides waiting to charge it, I'd say that would be another one of the big problems, also sources for getting electricity like using radioactive elements to attain it.

Or perhaps they'll come up with another energy source. We still have yet to perfect the energy of fusion though. That would make an endless source of energy. No one would have to purchase anymore fuel or energy to have the car run if each car had it's own source of fusion energy, even though it's somewhat unstable.

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"All we have to decide is what to do with the time that is given to us." -Gandalf

"Anxiety is the dizziness of freedom." -Soren Kierkegaard

Proverbs 1:7