Two (2) basic ways of producing hydrocarbon effectively. Yes you are correct, synthetic gas by natural gasification which produces small amounts of hydrocarbons and of course steam. The organisation that you are referring to deals more with heavy air particle(s) like for example. coal fired discharge as opposed to synthesis gas. 

I thought the carbon was needed in some processes to make hydrogen? - not as a fuel in itself

does anyone know if it is true that clean hydrogen production will add to demand for their carbon?