You try to project some image of being a mathematician or something.
CO2 is a greenhouse gas. We are pumping it into the atmosphere at rates that have resulted in readings far higher than have been seen in millions of years. Versus whatever else might happen for the earth over the next 500 years, 400+ parts per million CO2 is going to make it warmer than it would have been at 200 parts per million. Dispute that, if you can.