CO2 is not a pollution?
Well there is a difference of opinion on this. As everyone knows plants consume CO2 and put out oxygen. There is a theory that says if the atmosphere is rich in CO2 the plants take up more of it and put out more O2. More or less a self balancing system.
The carbon thereby trapped will either be burnt, thereby recombining it with the O2, be consumed by animals, thereby recombining it in various ways, or eventually become the fuel oil for whatever species follow us after a few million years