Your assertion that “CO2 breathes up and down on this planet, just like everything else” is untrue.
Our industrial release of CO and C02 is constantly on the rise and the natural check on these gases, photosynthesis, is constantly on the decline with the destruction of forest.
I know of no other physical system in which an attribute or variable can be consistently increased without check and the sytem not be completely changed with out reverse or break down.