The orbital sunshade would be difficult, but if we could use Moon dust, it might work. But I agree that there are people who won't change and help stablize the temperature, unless forced by the government (like the CFC ban). And we should at least dream and come up with wild ideas just in case, there might be something that we could do.
I don't understand the sulfur dioxide thing at all though. Not only would it increase air polution, the airplanes would need to burn lots of fuel. And gravity would bring the S02 down pretty quickly.
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