NOVELTY - Producing hydrogen-containing product gas, comprises: (a) introducing process stream (8) into catalyst-containing reformer tubes (14) and reacting; (b) reacting reformate stream (22) in presence of first shift catalyst to form additional hydrogen and carbon dioxide; (c) cooling; (d) reacting reformate stream in presence of second shift catalyst to decrease carbon monoxide concentration to less than 2 vol.%; (e) separating reformate stream to form carbon dioxide product stream, hydrogen-containing product gas and pressure swing adsorption tail gas; and (f) combusting fuel gas.    USE - The process is useful for producing hydrogen-containing product gas.    ADVANTAGE - The process provides the hydrogen-containing product gas with 75-80 carbon capture and reduced carbon dioxide emissions, when compared to conventional steam/hydrocarbon reforming processes, hence environmentally friendly.    DETAILED DESCRIPTION - Producing a hydrogen-containing product gas, comprises: (a) introducing a process stream (8) comprising steam and at least one hydrocarbon comprising methane, ethane, propane, butane, pentane or hexane into many catalyst-containing reformer tubes (14) in a reformer furnace (10) and reacting the process stream inside the reformer tubes at a first temperature of 700-960 degrees C and a first pressure of 1-3.5 MPa to form a reformate stream (22) comprising hydrogen, carbon monoxide, methane and steam and withdrawing the reformate stream from reformer tubes; (b) reacting the reformate stream from step (a) in the presence of a first shift catalyst comprising iron oxide at a second temperature of 330-450 degrees C and a second pressure of 1-3.5 MPa to form additional hydrogen and carbon dioxide in the reformate stream; (c) cooling the reformate stream from step (b); (d) reacting the reformate stream from step (c) in the presence of a second shift catalyst comprising copper at a third temperature of 190-340 degrees C and a third pressure of 1-3.5 MPa to decrease the carbon monoxide concentration in the reformate stream to less than 2 vol.% on a dry basis; (e) separating the reformate stream from step (d) to form a carbon dioxide product stream, the hydrogen-containing product gas, and a pressure swing adsorption tail gas comprising hydrogen, carbon monoxide and methane; and (f) combusting a fuel gas comprising the pressure swing adsorption tail gas and a supplemental fuel in the reformer furnace external to the reformer tubes at a firing rate to supply energy for reacting the process stream inside the reformer tubes, and withdrawing a flue gas (23) from the reformer furnace, where the hydrogen concentration in the fuel gas is 35-70 vol.% and the supplemental fuel provides 5-15% of the firing rate.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic flow diagram of the process for producing hydrogen-containing product gas.    Process stream (8)    Reformer furnace (10)    Reformer tubes (14)    Reformate stream (22)    Flue gas (23)