The earth, as it turns out, is pretty big. I don't think that you can get meaningful amounts of sunshades into orbit via rocket launches from Earth, even reall

The earth, as it turns out, is pretty big. I don't think that you can get meaningful amounts of sunshades into orbit via rocket launches from Earth, even really, really efficient rocket launches from Earth. As a wild-and-crazy concept, doing the lunar space elevator thing that Stross mentions in his blog post would allow you to build a manufacturing facility on the moon that turned regolith into a sunshade and then ship them up the lunar space elevator and drop them off into Earth orbit at a moderately reasonable cost. If you aren't too concerned about the mass of a sunshade, there are lots of ways to constitute them, so this seems like it would be one of the easier manufacturing jobs you might imagine locating on the Moon.