After reading an article about the Multi-Purpose Green Engine (MPGE), I suddenly realized one thing. What is a green rocket fuel? Is it a propellant combination with no carbon emission like hydrogen and oxygen? It is actually no. A true green rocket fuel has the minimum overall carbon footprint. You cannot ignore the carbon production during the manufacturing of those propellants.
Around 12 kilograms of CO₂ are emitted into the atmosphere for every kilogram of hydrogen produced. “Blue” hydrogen, which combines this process with carbon capture, emits three to five kilograms of CO₂ per kilogram of hydrogen. The blue hydrogen is also misleading. The carbon capturing processes have also a carbon footprint. Nothing is free in life. Actually, the more you complicate the process, the more carbon you emit.
Therefore, a fuel with minimum processing is the ideal fuel. In this case natural gas and methane are the ideal rocket fuels.
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