No big deal since hydrogen and carbon are chemical elements and do not come from fossils. "It may be supposed that naphta was produced by the action of water penetrating through the crevices of the strata during the upheaval of mountain chains because water with iron carbide ought to give iron oxide and hydrocarbons." -- Dmitri Mendeleyev, chemist, 1877 "One can, then, conceive the production, by purely mineral means, of all natural hydrocarbons. The intervention of heat, of water, and of alkaline metals -- lastly, the tendency of hydrocarbons to unite together to form the more condensed material -- suffice to account for the formation of these curious compounds. Moreover, this formation will be continuous because the reactions which started it are renewed incessantly." -- Marcellin Berthelot, chemist, 1866 Energy in general is infinite.