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This is the best tl;dr I could make, original reduced by 84%. (I'm a bot)


A Greenland ice core revealed that volcanoes discreetly release at least three times more sulfur into the Arctic atmosphere than what current climate models predict.
Jongebloed says, "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."
Alexander-referring to the gas that smells like rotten eggs-states, "We think that the missing emissions from volcanoes are from hydrogen sulfide. We think that the best ways to improve these estimates of volcanic emissions is to really think about the hydrogen sulfide emissions."


Extended Summary | FAQ | Feedback | Top keywords: aerosol^#1 volcanoes^#2 sulfate^#3 research^#4 climate^#5
“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.” >

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.