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From the paper: "leaked hydrogen chemically prolongs the lifetime of methane in the atmosphere, thereby contributing to global warming." Thanks for this knowledge re H2! Since H2 is so hard to contain without leakage (impossible?), this is a big deal and must be attended to for any sort of Hydrogen development!!
From pg19: "... detailed estimates suggest that if most of the US energy demand were addressed using green hydrogen, the CO2-equivalent emissions from hydrogen leakage could be as high as 10% of current emissions [37]."
[37] "Climate consequences of hydrogen emissions", Ilissa B. Ocko and Steven P. Hamburg, ACP, 22, 9349–9368, 2022 (https://doi.org/10.5194/acp-22-9349-2022)
Thanks for reading, Rick! Yes, H2 often diffuses through materials as well if not contained properly.