Re: ...They do not say how the “energy generator†works,
The energy generator could be a device that uses metal hydride that releases the hydrogen from the water.
After all, there are several ways to split water into hydrogen.
It still takes energy in the form of heat and hydrogen to make the hydride, but the oxide “pollution†can be recycled. The exhaust is water.
Hydrogen is abundant in water, we simply need an efficient method of extracting it.
http://en.wikipedia.org/wiki/Calcium_hydride
It takes energy to produce gasoline also, and gasoline pollutes the atmosphere.
Heck, I explained this process here many years ago.