James_Miller comments on Crazy Ideas Thread - Less Wrong Discussion
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Huge, thin mirrors in orbit over the equator that reflect light that would have hit the equator to the area of earth experiencing winter.
There's a high-stakes variational calculus problem. For what seasonal temperature profile do we get the best long-term minimum for the sum of "deaths due to extreme cold" and "deaths due to tropical diseases whose vector insects are stymied by extreme cold".