How big would the reflectors have to be, would they be in the L1 lagrange point? Maybe if SpaceX keeps lowering launch costs it will eventually be a no brainier?
In my mind, geostationary satellites with reflective properties are a solution to a symptom but not to the root cause. I was always taught to fix the root cause of problems, not their symptoms. Therefore I find your strategy to be sup optimal.
Having said that, I agree that if we find the root cause to be unsolvable, we should look into fixing some of the symptoms instead.
I agree with you on solving root causes. If we don’t, the oceans will acidify with co2 and there may also be bad effects from higher co2 in the air. Emerging studies show cognitive declines.
That said, both of those are slower moving crises to some extent. We may face acute challenges from excess heat and changing weather patterns. So it’s possible we’ll require an emergency stopgap while we fix the underlying issues.
Any thing interfering with enough sunlight to make a difference in global warming is a weapon, whether we recognize it as such or not.
TLDR: It's preposterous in just about every way, from the number of shades needed to the costs to the number of launches required.