The article discusses a study published in Communications Earth & Environment that evaluates the life cycle climate effects of hydrogen supply chains, focusing on hydrogen leakage and its impact on environmental consequences. Hydrogen is highlighted as a key technology for decarbonization in sectors like heavy-duty transportation and steel production due to its minimal carbon dioxide (CO2) emissions. Despite its benefits, concerns about hydrogen's life cycle greenhouse gas emissions persist, with the study emphasizing the importance of assessing emissions across the supply chain. Researchers used the 45VH2-GREET model to analyze different hydrogen production methods, revealing that considering hydrogen leakage could increase the climate impact by up to 0.5 kgCO2e/kgH2. Wind-powered electrolysis demonstrated the lowest emissions, while steam methane reforming (SMR) did not meet clean hydrogen standards. The study also highlighted the variability in hydrogen leakage rates and the importance of comprehensive assessments for effective policy-making and investment decisions. Real-world applications suggest that hydrogen can significantly reduce emissions in steel production and heavy-duty transportation, depending on the chosen production pathways. The research concludes by stressing the need for further empirical data on hydrogen leakage rates and comprehensive models to guide policy and investment strategies in the expanding hydrogen economy.