I am sure we have all heard the mantra of energy independance and getting fuel sources other than petroleum. And Eureeka! We discovered hydrogen!
When burned, it produces water vapor! The Perfect solution! Right?
Wrong! Where does hydrogen come from? Why it is a natural element! So it must be in nature! Not in enough quantity to mean diddly squat! SO it has to be extracted from water, and guess what? That requires a lot of dirty fuels to be used for the process!
And, while Hydrogen is a natural element, it is a dirty one too! Seems that Hydrogen containers 'leak' and the hydrogen then combines with other elements to form bad gases!
Lions and Tigers and Bears! Oh My! Save some Oil, burn Hydrogen! And polute the air away!