I think you're overly worried.
Almost any attempt to change the sun's output is going to have a 0.000% change. It is very much not easy to affect something that size.
Almost any attempt to change the sun's output is going to have a 0.000% change. It is very much not easy to affect something that size.
> These technologies promise to reverse global warming by reflecting away a portion of the sunlight reaching Earth, for example by spraying particles of sulphur dioxide or some other manufactured substance into the atmosphere.
The global maritime shipping industry has already been doing this, by accident, and their stopping (going to better fuel oil with less sulfur in it) has detectably raised global temperatures. [https://cpo.noaa.gov/the-unintended-consequences-of-reducing...]
But, second, yes, I know what they're talking about. I also know about the shipping thing. So (honest question), while that was happening, did it reduce the sun's radiation to the ground by 1%? 0.1? 0.01?
But it was enough to make a measurable difference in temperature. To make a meaningful difference in temperature is going to take, say, 10 times as much sulphur as the ships were putting out, or else putting it at more strategic layers of the atmosphere. So "most attempts" (most people who say "let's do this") aren't going to get anything like the scale that is needed.