IIRC, lime or something like that can be used as a carbon scrubber, but it’s not something that you’d want to do constantly and everywhere. Looked this up some time back.

Oh I’ve got some limes.

Soda lime.

Oh, well I can go get some of that.

Soda lime is a mixture of sodium hydroxide (NaOH) and calcium oxide (CaO).

Oh, so it’s not lime soda. It’s soda lime. Alright then… I’ve got some salt and milk.

best to ventilate to the outside and then run the exchanged air through a counterflow heat exchanger to preserve indoor temperature as much as possible.

Wait, I’m not supposed to drink it?