NOVELTY - Converting carbonaceous feedstocks into energy without the production of unwanted greenhouse gas emissions involves converting a carbonaceous feedstock in a gasification unit (with exit range of at least 700-1600degreesC) to synthesis gas; passing at least a portion of the synthesis gas to an interface zone to remove poisons and fouling compounds; electrochemically oxidizing at least a portion of the synthesis gas from the gasification unit; recovering the carbon dioxide; and electrochemically reducing an oxygen-containing gas.    USE - For converting carbonaceous feedstocks into energy without the production of unwanted greenhouse gas emissions.    ADVANTAGE - The process can produce syngas of high cleanliness, and convert carbonaceous feedstocks into energy without the production of unwanted greenhouse gas emissions.    DETAILED DESCRIPTION - Converting carbonaceous feedstocks into energy without the production of unwanted greenhouse gas (e.g., carbon dioxide) emissions involves:    (a) converting a carbonaceous feedstock selected from coal, hydrocarbon oil, natural gas, petroleum coke, oil shale, carbonaceous-containing waste oil, carbonaceous-containing medical waste, carbonaceous-containing military waste, carbonaceous-containing industrial waste, carbonaceous-containing medical waste, carbonaceous-containing sewage sludge and municipal solid waste, carbonaceous-containing agricultural waste, carbonaceous-containing biomass, biological and biochemical waste, and a greenhouse gas stream in a gasification unit to synthesis gas comprising carbon monoxide and hydrogen, the gasification unit is a noncatalytic high temperature, gas-phase reactor (34) operating at conditions to achieve a gas exit temperature of at least 700-1600degreesC;    (b) passing at least a portion of the synthesis gas to an interface zone to remove compounds selected from sulfur-containing, silicon-containing, halogen-containing, phosphorus-containing, and nitrogen-containing compounds and their mixtures from the syngas, the interface zone comprising:    (i) a high temperature filter (40) operating at 400-600degreesC;    (ii) a high temperature getter bed reactor operating at 400-600degreesC; and    (iii) condenser (56) operating at 0-15degreesC;    (c) electrochemically oxidizing at least a portion of the synthesis gas from the gasification unit in a first half-cell of a fuel cell (80) (anode) to a first half-cell exit gas comprising carbon dioxide and water;    (d) recovering the carbon dioxide from the first half-cell exit gas to serve as at least 20% of the greenhouse gas stream in step (A); and    (e) electrochemically reducing an oxygen-containing gas in a second half-cell of the fuel cell (cathode) completing the circuit and resulting in the production of electrical energy.    DESCRIPTION OF DRAWING(S) - The figure shows the process involving the fuel cell protective interfacing using commercial components between a industry-standard rotary kiln, a candle filter, desulfurizing bed, condenser, granular activated carbon bed, and a sulfur getter bed and guard bed to protect the downstream fuel cell from being poisoned.    Heat exchanger (32)    Gas-phase reactor (34)    High temperature filter (40)    Condenser (56)    Fuel cell (80)