Hydrogen (H₂) is an indirect greenhouse gas by increasing methane (CH₄) lifetime. Interaction between H₂ and CH₄ is important for hydrogen’s global warming potential (GWP). Global models do not represent this interaction well; H₂ or CH₄ are prescribed at the surface. We implement an interactive H₂ scheme into a global model coupled with interactive CH₄. We simulate scenarios demonstrating its capability, improving model performance and more accurately representing H₂-CH₄ interaction.