fuck off moron.  what is the next energy dense most common hydrocarbon , idiot?  methane. produced by oceans all over ocean floors.  methane is ch4 , idiot.  what important is number of h. here, of course. but as you can already see. water is h2o, and those h2 can also be used as energy.  energy is everywhere and abundant and we will never run out of it.   ne
United States