The general quote from NASA climate scientists and others is that the recent years increase in warming is unexpected even after accounting for the reduction in marine fleet SO2 emmissions and the parallel increase in high atmosphere SO2 from a large volcanic eruption.
Marine fuels were the last remaining stronghold of anthropogenic SO2.
The two large scale changes in recent years of atmospheric makeup were the SO2 generation reduduction from marine fuel phase outs and the unuual high altitude water vaper injection from a volcanic eruption.
Atmospheric gas makeup changes are mapped from a number of global sites, and recently mutlispectral orbiting gas sensors have been fine scale mapping sources.
