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I can’t find a single reputable scientific organization that argues in favor of ambitious climate engineering. The Union of Concerned Scientists, for example, is wholly against it. I recommend reading their explainer on it. “A lot of people and species will die” - you gloss over that callously like it’s all fine and dandy.

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Its horrifying, but we have proven we aren't going to do the things we need to until the sane options won't cut it. I agree that right now its a terrible idea, but when climate refugees are dying by the tens of thousands, and species are disappearing faster than the coastlines, climate engineering and its unforseen consequences will be what are left to us.

Sadly I think you’re right, assuming business as usual continues until it can’t. But a potential foil to that timeline would be technological civilization grinding to a halt, such that we couldn’t deploy geoengineering even if we wanted to. At that point it’s anyone’s guess.

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