Who said CO2? Who came up with the idea that someones arguing with Arrhenius proofs? What does our proof showing the existence of other greenhouse gases help

Who said CO2? Who came up with the idea that someones arguing with Arrhenius proofs? What does our proof showing the existence of other greenhouse gases help us with? Does any of this shed any light on whether it will be politically palatable to be doing fossil fuels i 20 years?