And in a much-discussed report last month, the climate researcher James E. Hansen argued that scientists had vastly underestimated how much more the planet would warm in the coming decades if nations cleaned up aerosols without cutting carbon emissions. Not all scientists are persuaded.
I’d say probably since we stopped dumping sulfur compounds into the atmosphere using all of our cargo ships
link
Yes, the article mentions that:
The math on that suggests it’s only part of what is happening.
Think this may be relevant to that hypothesis: