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Natural gas based hydrogen production with carbon capture and storage is referred to as blue hydrogen. If substantial amounts of CO₂ from natural gas reforming are captured and permanently stored, such hydrogen could be a low-carbon energy carrier. However, recent research raises questions about the effective climate impacts of blue hydrogen from a life cycle perspective. Our analysis sheds light on the relevant issues and provides a balanced perspective on the impacts on climate change associated with blue hydrogen. We show that such impacts may indeed vary over large ranges and depend on only a few key parameters: the methane emission rate of the natural gas supply chain, the CO₂ removal rate at the hydrogen production plant, and the global warming metric applied. State-of-the-art reforming with high CO₂ capture rates combined with natural gas supply featuring low methane emissions does …