gjm comments on Crazy Global Warming Solution Ideas - Less Wrong Discussion
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But are you thinking about direct radiation at the upper end, or evaporating water into outer space with Earth-escape velocity, or something else? See also my other comment.
I was thinking direct radiation, and assuming that either (1) they go deep as well as high, cooling down the magma or something, or (2) we plug them into some kind of huge mesh of highly-heat-conductive stuff all over the earth, or most likely (3) we just let the wind do its job: if some region is being cooled relative to the surrounding region, you'll get winds blowing that will equalize the temperature somewhat.
But, once again: crazy ideas.