Jonathan asked William in the opening post: "Do you understand that Tyndall’s work does not answer my questions?" I'd like to draw attention to that particular question because I think that the answer is "No."   William does not understand that Tyndall - plus Fourier plus Arrhenius - plus the fact that humans produce "greenhouse" gas emissions - is very far from sufficient to demonstrate AGW. Arctic sea ice is melting.  See!!!  Ergo. QED. What's all the fuss Jonathan mak