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Sulfur dioxide has a pretty short lifespan in the stratosphere. If an experiment does go "horribly," and honestly I can't imagine how an experiment, as opposed to a full scale geoengineering project, could really go that badly, it should be easy enough to just stop.

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"I watched Snowpiercer, and now I'm anxious, so we shouldn't do this."

I agree. But there is a novel called Termination Shock written by a fairly well known author about the danger involved in just stopping. Don't understand it myself

The "termination shock" in Stephenson's eponymous novel is that (in the novel) a successful large scale effort to change the climate is underway, and people don't want to turn it off because they like its effects (though others don't like its effects).

The termination shock was speculated and unknown, the people who wanted to turn it off were the ones who suspected were getting the short end of the stick because the monsoon being weaker or non-existent was one of the possible outcomes of that method of geoengineering.

I was trying to avoid spoilers.

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