So, lets get this straight: we can't use coal, we can't drill for oil, and God knows we can't build nukes. That leaves solar, wind, and biofuels (that use nearly as much energy to produce as they release). None of the "alternative" fuels (the ones that are going to be mandatory, which in my lexicon is the OPPOSITE of "alternative") are reliable or cost-effective.
So, what does that leave? Meet the energy source of the future:
It's not all bad news; they're cute and I think four of them should be able to out-accelerate a Prius.