"There is no small scale human comparable in room CO2 removal bio/tech." Of course the tech exists, it's just not common. Some submersible tech and space tech

"There is no small scale human comparable in room CO2 removal bio/tech." Of course the tech exists, it's just not common. Some submersible tech and space tech used rebreathers or scrubbers to remove CO2 and increase O2 levels. Of course the reason it's not common is that outside of those use cases you can generally just open a window.