So, if it is indeed sulfates cooling the warming, given that there is no net change in global temperature, then the northern hemisphere should be cooling since 1998 (the first year in Kaufmann’s paper) while the southern warms. Here are the sad facts…

The opposite is occurring. Why this test was not performed eludes me. Perhaps that is because it provides yet another piece of evidence supporting the hypothesis that we have simply overstated the sensitivity of surface temperature to changes in carbon dioxide.