Fig. 5: Total GHG emissions and emission reduction potentials of all hydrogen projects.
From: Global greenhouse gas emissions mitigation potential of existing and planned hydrogen projects
a, Overall and specific life cycle GHG emissions of hydrogen applications. b, Overall and specific GHG emission reduction potential compared with the business-as-usual scenario. c, Overall and specific GHG emission reduction potential compared with the low-carbon scenario. The different colours indicate the contributions of the different applications regarding overall life cycle GHG emissions and emission reduction potential. The secondary y axes (black lines) show the average specific annual GHG emissions (a) and average emission reduction potential per specific use of hydrogen (b,c). The dashed red line in a provides the summed total GHG emissions from hydrogen production only. Only positive emission reduction potentials are illustrated.
