TL Winslow's answer to How do climate skeptics reconcile their claim that CO2 is a mere trace gas unable to have any significant impact with the fact that essentially all the carbon in the carbohydrates basic to life today ultimately comes from photosynthesis of that CO2?

https://www.quora.com/How-do-climate-skeptics-reconcile-their-claim-that-CO2-is-a-mere-trace-gas-unable-to-have-any-significant-impact-with-the-fact-that-essentially-all-the-carbon-in-the-carbohydrates-basic-to-life-today-ultimately/answer/TL-Winslow