Hydrogen is used to start the nuclear reaction because it's just a proton once you strip the electron from it.Asterisk said:Two words; hydrogen BOMB
You launch that proton into the core and BOOM goes the nuclear chain reaction. For non-nuclear uses, hydrogen is pretty crap. It's used more as an energy storage device.
Now as far as air to gasoline conversion. It sounds nice if you want to be dependant on liquid fuels and it's pretty inefficient. What makes more sense is pouring more money and man power into designing proper batteries and battery technology and improving solar efficiency. Our planet is being bombarded with FREE energy from the sun. Why not make use of it and store it and use it?
Your roof is being bombarded with FREE energy. The roads, parking lots, skyscraper roofs could be collecting that energy and storing it for us to use. And there is so much space available. Instead we're wasting 1000W per square meter of free energy from the sun and burning fossil fuels and polluting our own air until we can't breathe.
We're completely retarded.