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I believe in climate change and I definitely believe that no matter what you think about climate change we need to reduce emissions, if nothing else for health reasons, but it’s things like this that make me question a bit how climate scientists can seem so sure about their predictions when there are so many unknowns/variables.
“There’s sort of a ‘diminishing returns’ effect of sulfate aerosols,
 the more that you have, the less the effect of additional sulfates. 
When we increase volcanic emissions, which increases the baseline of 
sulfate aerosols, we decrease the effect that the human-made aerosols 
have on the climate by up to a factor of two.”