The CO2 gathers in the air until plants or trees use it and then it will use the carbon which will continue the carbon cycle.
Trees absorb the co2 and when they die the carbon goes into the soil..The carbon goes into the plants and then the plants are eaten by animals and goes on forever.
The pollution from houses include carbon(Carbon Dioxide).
The animals eat the grass and or other food sources.these food sources contain carbon. In addition when these animals die their carbon goes back into the soil which will then repeat the process.