If SpaceX really starts to commercialize space (i.e. in 20 years with many hundreds of flights per year), ozone will be an issue with them, as well. It's somet

If SpaceX really starts to commercialize space (i.e. in 20 years with many hundreds of flights per year), ozone will be an issue with them, as well. It's something to watch, but I also wouldn't be particularly concerned until these things actually start to scale.