> At the rate we're going, we'll need these on Earth soon :(
Climate changes and dangerous weather events aside, I don't think that things are quite as dire, in regards to breathable air. Well, at least outside of certain metropolitan areas in certain countries.
That said, the fact that we even have the technology to do this is good - if we ever actually needed to utilize it after the collapse of too many ecosystems, at least we'd have the option to try scaling it up, provided that the powers that be would deem it "financially viable".
