The archaic models of that era both overestimated the cooling resulting from sulfur aerosols and the reductions of sulfur aerosols that occurred due to emissions regulations.
His global warming models left 75% of the earth out of the equation!
And further on models, if their ability is to be believed, please explain to us why when they are feed KNOWN data from past years weather they are not able to produce results that are close to what happened?