Stratospheric aerosol injection is the leading geoengineering proposal for a reason. If you have well-supported reasons to be skeptical, you should share it, but just saying "idk doesn't sound right to me" isn't convincing.
Even if it were meaningful, is the proposal to fight global warming to keep dirty ships? That’s an insane strategy.
More realistically, there’s vested interests in existing ships and shipyards not being made obsolete so any minute effect is overhyped as “this is how we solve global warming”.
This reminds me of a conversation I had with an acquaintance - he was convinced that anthropogenic global warming was impossible because a volcanic eruption emits so much CO2 and was completely unwilling to consider evidence that perhaps humans emitting annually 200x more than all volcanoes combined might have an effect.
You want to unthinkingly reject a proposal that makes things better because you can't understand the third order effects and refuse to accept any evidence.
The amount of aerosol you need to I next is enormous, it needs to be sprayed at an altitude higher than realistic means of injection are feasible, and it has to be done in a way that doesn’t produce so much CO2 that it defeats the point.
Can you imagine an extant tech that can come close to doing that at the required scale? I can’t.
It would be cheaper and more practical to talk about space-based sunshields, and that’s about as practical as prayer. At the altitudes any realistic glider can reach you’d have to use sulfur aerosols and not ice, and in either case you’d need to inject gigatons per year, every year because at that altitude aerosols are very short-lived.
A realistic aircraft capable of those payloads will burn avgas, no solar craft comes close to the capability. The side effects such as a significant increase in acid rain, are not trivial either.
These are fantasies of people who cannot accept the reality of what we’re facing.
