Forget hybrids, here's the kind of thing US automakers ought to be building. This is the long gone Ford Nucleon concept - yep, a nuclear powered car. The small reactor is right there in the back. Well, diesels are good too but just imagine how cool this thing would look cruising the local strip mall. So long as you don't get into an accident, the Nucleon would be a zero emissions vehicle.
Even though the Nucleon is atomic powered, the reactor would really just heat water turning it into steam - so it's more of a steam powered car than anything. A modern version of this car might be the fuel cell Chevrolet Equinox. I wonder what happens if you get it up to 88 miles per hour and Michael J Fox is driving...?