I’ve put together this map to show how the areas with reducing SO2 emissions in the period 2001-11 (blue) are linked by the trade winds with warming hotspots as shown by the 2001-11 GISS map. This shows that virtually the entire northern hemisphere’s climate change can be attributed to the location of areas that has their SO2 emission reduced. This strongly links warming in this area to reductions in SO2.
Note however that India and China have been increasing SO2 emissions. (Red) which are not obviously linked to cooling. This suggests that the warming was caused by some old technology that was taken out of service causing the warming and that new technology no longer has the effect.
- Change in regional distribution of anthropogenic land based SO2 emissions. Changes indicated as a difference between 2010 and 2005 emissions in 0.5° × 0.5° grids. http://iopscience.iop.org/article/10.1088/1748-9326/8/1/014003
- Trade wind directions
- The GISS map of annual (January to December) temperature trend (change) from 2001 to 2011. The –0.01 in the top right corner is the global trend figure, 0.01°C cooling. Source.