[Ditto]

So, we burn some fuel, inefficiently, to create H2 and then burn the H2 to, inefficiently, move an automobile or to generate electricity? Sounds rather inefficient.

That wasn't what I suggested at all. Go back and read the post again. Energy sources are not fungible. Some are best suited for one application but totally wrong for others. A blind measure of efficiency even if technically accurate is meaningless economically.

[Toddsterpatriot]

Fine, hydrogen fuel cells are great for space travel. For cars they would be stupid. How does this make my earlier points wrong? A hydrogen economy would include what? We are talking about energy usage on this planet, right?

And why is a hydrogen economy a good idea? To reduce CO2? Is CO2 a threat?