

The technology plans for these fuel cells aren’t “for now”. They’re for a future where we’ve hopefully already decarbonized most of the electric grid, as doing so is way more important than decarbonizing aviation. Converting fleets of airplanes to electric is a long process that will probably not be started for a while yet while there are more important carbon emission sources to tackle (aviation is only 2-3% of the emissions right now).
This was my first thought as well. Both sodium hydroxide and sodium bicarbonate seem like they could have a signficant environmental impact. We’d need some good studies on that before committing to this idea, I think.