Concrete production is a CO2 source that most overlook.
To be honest, most robust building materials produce CO2, concrete, bricks, steel, etc.
Timber is better and plasterboard (sheetrock in some countries) uses gypsum which is produced by de-sulfurising incinerator gasses, so is a CO2 soak.
But timber houses are more of a fire risk and need more maintenance.
No easy answers.
