... Defintiely a thing to be concerned about, but I feel like it at least might be possible for the basics to pencil out toward 'actually makes sense', if you can make a heavy lift vehicle that 'exhales' not CO2.
Like, if you use LOX and LH2... that produces primarily water vapor.
Once upon a time we actually tried to make an actual 'space ship', an SSTO, reusable, heavy lift vehicle.
https://en.wikipedia.org/wiki/VentureStar
Got cancelled because it was decided that this project needed to be a testbed for a whole bunch of experimental components and component manufacturing tech all at the same time, and well the fancy pantsy composite honeycomb tank didn't work out.
The engineers proposed a replacement with more standard fuel tank construction and construction methods... but that got kiboshed for some reason, and then the whole project got axed.
And then not long after that, we decided that actually we should just throw money at SpaceX, basically.
So with that plan we're now 4 years behind scheduled delivery (and counting) and still have yet to generate a heavy lift vehicle that achieves orbit, but it has produced a lot of... large explosions, mostly, and OSHA and EPA violations.
=D


