[TaylorAlexander]

I’m pretty sure NASA has been reusing carbon on human spacecraft since at least the Apollo program.

[idlewords]

That is not the case; carbon (as CO2) was captured by disposable LiOH cartridges through the end of the Shuttle program. On the ISS, it's captured on zeolite beds and vented into space. Except for a few small-scale plant experiments, no space program has demonstrated carbon capture and re-use.

[TaylorAlexander]

Ah I see, thank you! I figured someone would know better than me on this.