[agedav]

Nobody seems to have figured out that producing hydrogen takes huge amounts of energy. The earth does not have any free hydrogen floating around, even tho' it is the most abundant element. All of it is tightly bound in substances like water, hydrocarbons, and living creature tissue. Hydrogen is effectively a (very inefficient) way to store energy.

Yes, I do know what a fuel cell is. And yes, I do know how to make hydrogen. The problem is that the making of hydrogen is thermodynamically inefficient. Moreover, storing, transporting, and using hydrogen as a fuel are all problematic. It is a low-density fuel, meaning that it takes much more space. It is a very dangerous fuel. Does anybody remember the German dirigible "Hindenburg"? It was a great bag filled with hydrogen. When it ignited, the entire airship burned in seconds. (No, I am not old enough to remember it. I just know my aviation history.)

[newzjunkey]

Hydrogen Exonerated in Hindenburg Disaster

[Rastus]

and living creature tissue.

Like that alien crystal said, we are ugly bags of mostly water.