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Here in Germany with have quite a few hydrogen powered buses.

Examples:

(German) https://www.ksta.de/region/rhein-erft/huerth/ab-2019-neue-wa...

But also elsewhere in Europe (here: South Tyrol, Italy): http://www.greenmobility.bz.it/en/projekte/die-bozner-wasser...

Nothing but water vapor coming out of them.




> Water vapor is the most potent greenhouse gas owing to the presence of the hydroxyl bond which strongly absorbs in the infra-red region of the light spectrum. [1]

Though I can't tell whether water vapor created at the surface has the same effect as water vapor at altitude.

[1] https://en.wikipedia.org/wiki/Water_vapor




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