The Role of Sulfur Dioxide Aerosols in Climate Change

by Buel Henry, May 26, 2015 in WUWT

Anthropogenic emissions of SO2 into the troposphere peaked during year 1972 at about 131 Megatonnes. By year 2000, due to worldwide Clean Air Act efforts, SO2 emissions in the West had decreased by approximately 48 Megatonnes. However, during the same time period, emissions elsewhere rose by 23 Megatonnes, for a net worldwide decrease of 25 Megatonnes.

Figure 1: Global sulfur dioxide emissions by region (North Amer- ica = USA,Canada; East Asia, Japan, China, and South Korea). J.Smith et al., Fig 6.

It also proves that the IPCC “Graph of Radiative Forcings” is completely incorrect, since it does not include any warming due to the removal of dimming-aerosols from the atmosphere. To be correct, this forcing needs to be included (which will have the effect of completely eliminating any forcing due to CO2). As noted above, all of the warming can be accounted for by the reduction in SO2 emissions.