The average "person on the street" here in the US knows so little about
thermodynamics that they think we should run our cars on hydrogen because,
"The oceans are full of it.....water is 2/3 hydrogen" They don't seem to
understand that the hydrogen in water is already burned, and must be
extracted back from the water at great expense, just as you would have to
extract the gasoline back from the exhaust gases at great expense if you
wanted to re-use gasoline. It is very frustrating.....I think they should
teach elementary thermodynamics in our grammar schools. When they find out
that you have to pump electricity through salt water in order to get the
hydrogen back out of it, they think that will not pollute the air like
gasoline does, but they forget that 60% of the electricity we use in this
country is made by burning coal, and this pollutes the air worse than
gasoline, so using hydrogen in cars will still pollute the air somewhere,
even if it doesn't pollute it wherever the cars happen to be at the time. -
Thermodynamics teaches you that there is no free lunch.........:^)