Re: Ah yes - all the chlorine
That's the direct emissions - it's the reactions around the plume during ascent which aren't (yet) well characterised - though I can't imagine why they wouldn't be easily simulated/calculated/tested.
Rockets are a trivial drop in the damage we are doing to the climate - but that's alot of damage and it's not unreasonable to look at what affect they have.
Ignoring different chemistries is distinctly unhelpful though.