And it's good for the planet, too: the trees absorbed carbon when they were growing up, and they gave off oxygen, and now that carbon is trapped inside the walls and it's not being released into the atmosphere.
Şi este şi ecologică: copacii au absorbit carbon  în procesul de creştere, şi au eliberat oxigen. Acum, acel carbon e prins în ziduri, fără a mai fi eliberat în atmosferă.