Typically the solution to high CO2 in indoor air is to exchange it with outdoor air.
Most users will open a window. The energy cost of that is relatively huge, when room air is heated or cooled.
In modern eco buildings, there might be counterflow heat exchangers - those can recover 80+% of the heat - but still, the energy loss through air exchange can quickly add up to be a major component of the buildings energy bill.
I believe we should work towards buildings that don't exhaust dirty air to the environment. Throwing away contaminated stuff and letting nature deal with it is 1900's thinking. We should instead break that CO2 back into oxygen, filter the dust, and remove VOC's. We should fix the air, not replace it.
So far, to my knowledge, nobody does this except on submarines.