What these people need is a college level course on thermodynamics. None seem to understand the 2nd law of thermodynamics. Arguably, they don't understand the zeroth either.
Hydrogen fuel does nothing to improve energy efficiency. It is only a means of transporting energy. It shifts the pollution problem from one location to another, but does not reduce it.
The other savings are miniscule effects: a few percent at best.
Since they all advocate solar, wind, tide, geothermal energy, I am waiting for them to throw their full support for karma based energy.
Alas.
They know that. They also know how much more scarce natural gas we'll burn pretending we're getting cleaner air. That's why the NRDC geeks who foisted the power crisis and wrote Arnold's environmental plan is funded by oil and gas interests.