A process comprising: supplying a hydrocarbon feed and a steam feed into a syngas producing unit comprising a reforming reactor under syngas producing conditions to produce a reformed stream exiting the reforming reactor, wherein the syngas producing conditions include the presence of a reforming catalyst, and the reformed stream comprises H 2, CO, and steam; cooling the reformed stream by using a waste heat recovery unit ("WHRU") to produce a cooled reformed stream and to generate a high-pressure steam ("HPS") stream; contacting the cooled reformed stream with a first shifting catalyst in a first shift reactor under a first set of shifting conditions to produce a first shifted stream exiting the first shift reactor, wherein the first shifted stream has a lower CO concentration and a higher CO 2 concentration than the cooled reformed stream; cooling the first shifted stream to obtain a cooled first shifted stream; contacting the cooled first shifted stream with a second shifting catalyst in a second shift reactor under a second set of shifting conditions to produce a second shifted stream exiting the second shift reactor, wherein the second shifted stream has a lower CO concentration and a higher CO 2 concentration than the cooled first shifted stream; abating steam present in the second shifted stream to produce a crude gas mixture stream comprising CO 2 and H 2; recovering at least a portion of the CO 2 present in the crude gas mixture stream to produce a CO 2 stream and a H 2 -rich stream, wherein the H 2 -rich stream comprises H 2 at a concentration of at least 80 mol%, based on the total moles of molecules in the H 2 -rich stream; and (VIII) supplying a portion of the H 2 -rich stream to an olefins production plant comprising a steam cracker as at least a portion of a steam cracker fuel gas, and combusting the steam cracker fuel gas to provide thermal energy to the steam cracker. supplying a hydrocarbon feed and a steam feed into a syngas producing unit comprising a reforming reactor under syngas producing conditions to produce a reformed stream exiting the reforming reactor, wherein the syngas producing conditions include the presence of a reforming catalyst, and the reformed stream comprises H 2, CO, and steam; cooling the reformed stream by using a waste heat recovery unit ("WHRU") to produce a cooled reformed stream and to generate a high-pressure steam ("HPS") stream; contacting the cooled reformed stream with a first shifting catalyst in a first shift reactor under a first set of shifting conditions to produce a first shifted stream exiting the first shift reactor, wherein the first shifted stream has a lower CO concentration and a higher CO 2 concentration than the cooled reformed stream; cooling the first shifted stream to obtain a cooled first shifted stream; contacting the cooled first shifted stream with a second shifting catalyst in a second shift reactor under a second set of shifting conditions to produce a second shifted stream exiting the second shift reactor, wherein the second shifted stream has a lower CO concentration and a higher CO 2 concentration than the cooled first shifted stream; abating steam present in the second shifted stream to produce a crude gas mixture stream comprising CO 2 and H 2; recovering at least a portion of the CO 2 present in the crude gas mixture stream to produce a CO 2 stream and a H 2 -rich stream, wherein the H 2 -rich stream comprises H 2 at a concentration of at least 80 mol%, based on the total moles of molecules in the H 2 -rich stream; and (VIII) supplying a portion of the H 2 -rich stream to an olefins production plant comprising a steam cracker as at least a portion of a steam cracker fuel gas, and combusting the steam cracker fuel gas to provide thermal energy to the steam cracker.