NOVELTY - Bacterial cell comprising at least a first exogenous nucleic acid sequence, is new, where the cell converts gaseous carbon dioxide, gaseous hydrogen and/or syngas into one or more lipids or hydrocarbons.    USE - The bacterial cell is useful for producing lipids and/or hydrocarbons including alkane, alkene, alkyne, fatty alcohol and/or fatty aldehyde, preferably hydroxylated fatty acids, butanediol or other biochemical precursors of butanediol including 2,3-butanediol, 1,4 butanediol and 1,3 butanediol, which are useful as a precursor to a component of jet fuel, diesel fuel, or biodiesel fuel, where the cell is Rhodopseudomonas sp., Rhodospirillum sp., Rhodococcus sp., Nocardia sp., Mycobacterium sp., Gordonia sp., Tsukamurella sp.,Rhodobacter sp., Rhizobium sp., Thiocapsa sp., Pseudomonas sp., Hydrogenomonas sp., Hydrogenobacter sp., Hydrogenovibrio sp., Helicobacter sp., Oleomonas sp., Xanthobacter sp., Hydrogenophaga sp., Bradyrhizobium sp., Ralstonia sp., Alcaligenes sp.,Variovorax sp., Acidovorax sp., Anabaena sp., Scenedesmus sp., Chlamydomonas sp.,Ankistrodesmus sp. or Rhaphidium sp., preferably Rhodococcus opacus (all claimed).    ADVANTAGE - The bacterial cell economically produces the carbon based product with high yield and low carbon dioxide emission.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a method of producing a lipid and/or a hydrocarbon, comprising culturing the bacterial cell in a feedstock comprising syngas and/or gaseous carbon dioxide and/or a mixture of carbon dioxide gas and hydrogen gas;    (2) a microorganism comprising the first exogenous nucleic acid sequence, where the microorganism converts gaseous carbon dioxide, gaseous hydrogen and/or syngas into one or more hydroxylated fatty acids;    (3) a method-I for producing hydroxylated fatty acids, comprising (a) culturing an engineered microorganism or a natural strain in the feedstock in a bioreactor or solution;    (4) a method-II for producing shorter-chain fatty acids, comprising the step (a) as above per se; and    (5) a method-III of producing butanediol, or other biochemical precursors of butanediol by microbial fermentation under microaerophilic or anaerobic conditions, comprising supplying an inorganic substrate as a primary source of metabolic energy, where the substrate consists of one or more electron donors and electron acceptors, and performing fermentation of a bioreactor containing a culture of microorganisms using an inorganic substrate as a primary source of metabolic energy and carbon dioxide or other inorganic carbon as the primary source of carbon.