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My forecast is that heavy diesel engines (excavators, farm equipment, ships, maybe trains) will be replaced by hydrogen power. Either fuel cells in the 100-800 kW class, or gas turbines for the megawatt to tens of megawatt applications. For the latter, you might need to blend hydrogen with e.g. ammonia to slow down combustion, but we'll get there.

I've read somewhere that bio fuels make a lot of sense for powering agricultural machinery, while they'd be disastrous if we tried to power all cars with them.

Everything is easier with methane and even compressed natural gas has better storage density than liquid hydrogen (liquefied natural gas destroys hydrogen in energy per unit volume).

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