Acid rain _was_ bad, and I'm not trying to ignore it. However, my understanding is that we've already brought down sulfur emissions by an enormous amount over t

Acid rain _was_ bad, and I'm not trying to ignore it. However, my understanding is that we've already brought down sulfur emissions by an enormous amount over the past 30 years, and the 2020 value was a very small fraction of our peak sulfur emissions [1]. The IMO change took place in 2020, and it's my understanding that the IPCC statement about 0.5C of cooling coming from sulfur emissions is relatively recent. I think our current level of sulfur emissions is closer to being acceptable than our current warming trend. I'm not pretending that cooling via sulfur emissions is without costs -- but e.g. if living at 2018 levels of sulfur emissions (which were already 90% down from peak) can give us 0.5C of cooling, that's a deal I'm willing to take, especially in light of how hard it is proving to reduce carbon emissions. It especially seems like we're hitting a number of tipping points with warming, and if sulfur emissions (or any other albedo-increasing intervention) can keep us from crossing those lines, we should, in my view. Would we be better off with 2014-level sulfur emissions? 2008? At _some_ point, trading sulfur emissions for cooling becomes a bad deal, and we shouldn't scale up without limit. But is it a good direction to move from where we are now? I think so. [1] https://www.acsh.org/news/2021/07/09/whatever-happened-acid-rain-15651 https://www.acsh.org/news/2021/07/09/whatever-happened-acid-...