NOVELTY - The process involves converting carbonaceous feedstock and a greenhouse gas stream e.g. carbon dioxide in a gasification unit e.g. non-catalytic high temperature, gas-phase reactor (12) to syn gas comprising hydrogen and carbon monoxide. The reactor has a rotary kiln (14); and operates at a gas exit temperature of 700 - 1600 degrees C.    USE - For converting carbonaceous feedstocks into electrical energy without greenhouse gas emission in petroleum refinery or petrochemical plant; for converting portion of syn gas into useful hydrocarbon products (claimed).    ADVANTAGE - The process avoids high pressure operations or use of expensive catalyst. The process/system uses unique gasification technology combined with fuel cells to generate electricity at high efficiency without any carbon dioxide or other greenhouse gas emission. The carbon monoxide can be used to produce useful chemicals instead of discarding the valuable carbon source in the carbon dioxide. Use of wide variety of waste streams as feed material makes the gasification process more flexible.    DETAILED DESCRIPTION - The process further involves electrochemical oxidation of a portion of syn gas at the anode (42) of a fuel cell (26) to first half-cell exit gas comprising carbon dioxide (a1) and water; recovering (a1) to serve as at least 20% of greenhouse gas stream in the first conversion step; and electrochemical reduction of an oxygen-containing gas e.g. air at the cathode (60) completing the circuit to result in the production of electrical energy. The carbonaceous feedstock is coal, hydrocarbon oil, natural gas, petroleum coke, oil shale, carbonaceous-containing waste oil, carbonaceous-containing medical/military/industrial/municipal solid/agricultural/biological and biochemical waste, carbonaceous-containing sewage sludge and/or carbonaceous-containing biomass.    An INDEPENDENT CLAIM is included for a system comprising a gasification unit and a fuel cell.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic flow diagram of the process and system.    gas-phase reactor (12)    rotary kiln (14)    fuel cell (26)    Fisher-Tropsch catalytic reactor (30)    anode (42)    conducting membrane (44)    cathode. (60)