NOVELTY - Fabricating hydrocarbons and oxygenated hydrocarbons comprises: (a) performing an endothermic gasification reaction with a biomass reactant at less than or equal to 750 K, to yield synthesis gas; (b) performing an exothermic synthesis gas utilization reaction or carbon-carbon bond-forming reaction with the synthesis gas at a temperature greater than or equal to temperature of gasification reaction performed, where the reaction produces hydrocarbons or oxygenated hydrocarbons, and heat; and (c) integrating heat generated from step (b) with step (a).    USE - The method is useful: for fabricating hydrocarbons (preferably 2-36C linear or branched hydrocarbons) and oxygenated hydrocarbons (claimed); and to process waste glycerol from bio-diesel plants into liquid fuels.    ADVANTAGE - The method: significantly improves the economics of green Fischer-Tropsch synthesis by reducing capital costs and increasing the thermal efficiency of the reactions i.e. the gasification reaction will function using a feedstock having a high concentration of glycerol (25 wt.% and higher), thus provides value-added organic compounds from the large (and growing) amounts of glycerol that are created as a by-product of bio-diesel production; allows for smaller scale Fischer-Tropsch reactors to be incorporated as a component of a bio-refinery; utilizing step of integrating two reactions into a single reactor, which avoids the highly endothermic and exothermic steps that result from running the reactions separately; involves integrating the gasification reaction and the carbon-carbon bond-forming reaction into a single pot eliminates the inhibiting effect of carbon monoxide partial pressure on the rate of the gasification reaction by consuming the carbon monoxide in the same reactor (in the carbon-carbon bond-forming reaction), and produces chemical synergies; provides synthesis gas with high rates and high selectivities, at temperature that are significantly lower compared to conventional gasification of biomass, where the synthesis gas produced from glycerol can be used to produce methanol, which is an important reactant in the transesterification process, thus decreases the bio-diesel production cost by utilizing the glycerol by-product; and provides energy efficient route fro producing fuels and chemicals from renewable biomass resources, preferably glycerol.