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. 2022 Dec 13;13:7706. doi: 10.1038/s41467-022-35419-7

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Fig. 3 — a Changes in H₂ and CH₄ sources (ΔS) due to green and blue H₂ production (≈500 Tg yr⁻¹). HEI is the H₂ emission intensity. Gray lines mark the case for HEI = 0%. Blue bars for $Δ S_{{CH}_{4}}$ are obtained with HEI = 10%. b Response of CH₄ atmospheric concentration. The right axis shows the Δ[CO₂e] that would produce equivalent radiative forcing to the change in equilibrium CH₄.