Ok I wasn't trying to insinuate any lack of knowledge on your part Jo, you just did that yourself by dodging the issue. The fundamental thing we are both talking about is energy. In what form, is the input energy to this fuel, however you wish to call it? If you can't identify the input source of energy, then there is nothing to promote, you need to be able to show how it compares with something like hydrogen, that we can see how the energy goes into, in order for it's relative merits to be discussed.
What is the energy content of the "Carbonates" you mention, where did the Joules in those come from?