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OddGambit t1_iy89emv wrote

Reply to comment by jonanzr in Rolls-Royce successfully tests hydrogen-powered jet engine | Britain's Rolls-Royce said it has successfully run an aircraft engine on hydrogen, a world aviation first that marks a major step towards proving the gas could be key to decarbonising air travel. by yourSAS

I would add that jets in particular are difficult for a green transition.

High power and portability requirements really limit your options.

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