Synthetic Gasoline (Score 1)

The hydrogen fuel cell is often said to be a future replacement for oil. But, of course, hydrogen is not a source of energy itself. The plan of the Bush administration is to develop a new generation of very small, safe (no really), distributed nuclear power plants that can then be used as the power source to produce hydrogen for the fuel cells. What I want to know is this. If we have a source of very cheap nuclear energy, can't we just skip the hydrogen and make synthetic gasoline. I'm not a chemist, but isn't gasoline just an energy dense hydrocarbon. Don't plants take water, carbon dioxide from the air, and add in energy from the sun to make hydrocarbons. So assuming these nuclear power plants do provide a very cheap source of energy (and that is a big assumption), and it is located next to a river, can we not produce synthetic gasoline. This would skip the whole step of transforming over to a hydrogen-based economy and all that it entails (new automobile technologies, new hydrogen fueling stations, etc). The carbon that the autos produce would the same carbon that was taken out the air when the synthetic gasoline was produced so the greens should be happy. Can anyone tell me why this would not work?