How green is blue hydrogen?

Abstract Hydrogen is often viewed as an important energy carrier in a future decarbonized world. Our analysis assumes that captured carbon dioxide can be stored indefinitely, an optimistic and unproven assumption.

⚡ This is an original paraphrased summary — not copied from the abstract. Full paper available at the source link below.

• 1 Currently, most hydrogen is produced by steam reforming of methane in natural gas (“gray hydrogen”), with high carbon dioxide emissions.
• 2 Increasingly, many propose using carbon capture and storage to reduce these emissions, producing so‐called “blue hydrogen,” frequently promoted as low emissions.
• 3 We undertake the first effort in a peer‐reviewed paper to examine the lifecycle greenhouse gas emissions of blue hydrogen accounting for emissions of both carbon dioxide and unburned fugitive methane.

These innovations can translate to real-world improvements in technology, infrastructure, and everyday tools.

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