I have argued with otherwise intelligent people who sound exactly like the person above. It is a strange contrarian mentality with no basis in the science as they claim. I once even took up the challenge from someone who said I was afraid to investigate the “other side”. I read every single thing he sent me and they were all rubbish. Not a one of them even support the claims he made. When I responded saying this just fired back that I was brain-washed or carrying water for commies or other such inanities. It became clear after a while that he did not even understand the basics of the greenhouse effect or how CO2 and other gasses cause it. I was utterly flabbergasted.
long story short : the person above may have the degrees they claim but they are not educated on this subject. It is so simple even a layman can understand it so they have no excuse.