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> we can decarbonize the existing vehicle fleet without replacing it.

Put that way, it's a huge improvement and avoids having to electrify entire fleets first.

Now for aircraft I can see how it makes sense, but anything ground based could easily be electrified.

Another thing, will this synthetic diesel burn cleanly like hydrogen or do they need to add lots of nasty stuff?

The very high density is in hydrogen - actually.

And the best way to store hydrogen is to attach it to carbon atoms.