Not to be nit-picky, but that wasn't an equation. It was a thought experiment set in an extremely controlled environment. The assumption that that's exactly how it would work in Earth's atmosphere under natural conditions is a mistake, imo. Further, is the measured increase in C02 a direct result of carbon emissions from fossil fuels? Could it possibly be due to a proportionate loss of oxygen being generated from various sources? I have yet to find a source I deem trustworthy for such information, due to both the relative newness of climate science and it's politicization by people on both sides of the issue. Until I'm convinced one way or the other, I will not support any legislation or government involvement of any kind in further taxation or regulation of American industry based on climate science or claims of global warming.