Hydrogen Reality Check #1: Hydrogen Is Not a Significant Warming Risk

This RMI fact sheet argues that hydrogen is not a significant warming risk and is a powerful tool for decarbonizing hard-to-electrify sectors. It asserts that hydrogen's warming potential is significantly lower than that of the natural gas it replaces, particularly when considering energy density. The document emphasizes that focusing deployment on industrial hubs and prioritizing green hydrogen can minimize leakage risks and maximize emissions reductions.

• Hydrogen is a viable tool for decarbonizing sectors where electrification is not possible, with the potential to reduce emissions by 11–13 kg CO2e per kg used compared to fossil fuels, and 25–30 kg CO2e per kg in steelmaking. In the United States, large-scale deployment could abate approximately 15 percent of annual carbon dioxide emissions.
• While leaked hydrogen acts as an indirect greenhouse gas by extending the atmospheric lifetime of pollutants like methane and affecting ozone concentrations, its climate impact is lower than that of natural gas. Hydrogen is 2.5 times more energy-dense than methane (120 MJ/kg vs 50 MJ/kg), meaning methane's warming impact is up to seven times worse when measured by the energy contained in each molecule.
• The climate benefit of green hydrogen remains positive even at high leakage rates, especially compared to the fossil fuels it replaces. Blue hydrogen's climate alignment is more uncertain due to risks associated with low carbon capture rates and upstream methane leakage.
• To minimize leakage risks, hydrogen development should be focused on centralized industry and transport hubs, such as maritime shipping fuel, which reduces the need for extensive transmission and distribution networks. Decentralized uses like passenger transport and building heating are considered higher risk for leakage and better suited for electrification.

APA

RMI (2022). Hydrogen Reality Check #1: Hydrogen Is Not a Significant Warming Risk. https://rmi.org/resources/hydrogen-reality-check-1-hydrogen-is-not-a-significant-warming-risk/

Chicago

RMI. Hydrogen Reality Check #1: Hydrogen Is Not a Significant Warming Risk. 2022. https://rmi.org/resources/hydrogen-reality-check-1-hydrogen-is-not-a-significant-warming-risk/.

Wikipedia

{{cite report |author=RMI |title=Hydrogen Reality Check #1: Hydrogen Is Not a Significant Warming Risk |date=9 May 2022 |url=https://rmi.org/resources/hydrogen-reality-check-1-hydrogen-is-not-a-significant-warming-risk/ |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{rmi2022hydrogen, author = {{RMI}}, title = {{Hydrogen Reality Check \#1: Hydrogen Is Not a Significant Warming Risk}}, institution = {RMI}, year = {2022}, month = may, url = {https://rmi.org/resources/hydrogen-reality-check-1-hydrogen-is-not-a-significant-warming-risk/}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }