> Any SRM program that purported to be serious about mitigating global warming would have to operate at a level of a few million tons of SO2 per year, or a few percent of what is already coming from volcanoes, fossil fuels, and wildfires.

This really doesn't get mentioned enough. I didn't realize the scale of what would have the desired effect was so small in comparison to what's happening without human intervention. I hadn't exactly done a deep dive, but any media I saw about it made it look like it was many times more SO2 than would be emitted otherwise.