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...but sulfide injection to the stratosphere is probably the cheapest. But of course, really high CO2 levels aren’t good, even with moderate temperatures.
Wouldn't sulfide injections end up increasing atmospheric particulates? How long would sulfides remain suspended?
It would have to be done continuously, but the costs aren’t that great.
And yeah, there are environmental consequences to it. I don’t favor it (except in an emergency). But it’s stupidly cheap, like $10 billion per year. Wikipedia article: https://en.wikipedia.org/wiki/Stratospheric_aerosol_injection_(climate_engineering) …
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