According to this piece. Instead, solar is the place you oughta be. So, they packed up the windmill and they moved to Beverly.
I'm still kind of bullish on the Dyson sphere....problem being the immense scale and construction cost...
another option is a configuration where the moon is used to bounce sunlight back to the earth or near-earth orbit using hundreds of thousands or millions of mirrors. the advantage to this is avoiding the atmosphere's effect on diluting sunlight and utilizing the fact that the moon is locked in earth-facing orbit all the time, which should be good for something...builds on archimedean concept
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