I'm trying to understand sulphur aerosols better, partly to improve the wiki. As far as I can see, they are popular as a geoengineering technique because they're pretty cheap, emulate volcanoes which are well-tolerated and understood, and rely on existing technology such as artillery. However, I've not seen any research that looks at the upper limit to this technology. Can you just go pumping H2S or SO2 into the stratosphere till your heart's content, or does something fundamentally break if you do it too much, for too long or in too concentrated an area?
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