I heard about this years ago and only recently that the idea proved unworkable or with unintended consequences. One thing is that is too small a scale compared to global efforts to halt CO2 emissions, has unknown consequences(like that spraying stuff into the sky, or the tree growing thing). One point in "The Ministry of the Future"
Kim Stanley Robinson) where this method was mentioned is that everyone should try everything- to have a chance at all. But we are still hodge-podge, looking for an easy out and working more against our survival than otherwise, generally.
Of course, Robinson has the Ministry's Kali branch assassinating and sabotaging a lot for a long time. Mostly we just have the usual wars and chaos against the little people.
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