For SB, the methane is a product of natural gas processing plant, its associated environmental impact was included in the analysis. However, the transportation of natural gas was assumed using pipeline and thus excludes from the analysis. SB2 consist of reactions and purification section. The reactions system includes a MSR and WGS reactor. In this section, methane reacts with steam to produce hydrogen in a MSR reactor while the gas produced then enters a WGS reactor to convert CO to CO2 and increase hydrogen yield. The separation section on the other hand, consists of carbon dioxide removal and a separator. The aim of this section is to purify the hydrogen especially from carbon dioxide. The system boundary also considers process steam generation section (SB3). This section considers the combustion of hydrocarbon fuel in the boiler to generate steam which it used during plant operation. Meanwhile, SB4 is the MEA supply subsystem which supply absorbents for CO2 removal in the separation process. Finally, the water supply for the reforming process and cooling water were came from the process water plant (SB5)