Life Cycle Greenhouse Gas Reductions According to Sectors Using Green Hydrogen: Comparison of Transportation Sector and Other Sectors

This study evaluates the life cycle greenhouse gas reductions using hydrogen in the load transportation sector as well as the power generation and steel industry sectors. The life cycle greenhouse gas emissions of coal, gasoline, diesel, natural gas, and electricity have been referenced from the author's previous studies for calculation purposes. Results showed that using hydrogen in light-duty and heavy-duty vehicles reduce 21.4 and 12.5 kg-CO2 -eq./kg-H2, respectively. Using hydrogen in the steel industry can reduce 24.2 kg-CO2-eq./kg-H2, which is larger than the load transportation values. Using hydrogen in fuel cell power generation can reduce 10.0 kg-CO2 -eq./kg-H2, which is smaller than the load transportation values, when the generated power replaces the national average electricity. Finally, the life cycle greenhouse gas reductions were compared with the life cycle greenhouse gas emissions of various hydrogen production methods.