What I mean is bad localized effects in important areas. Painting roofs sounds completely benign, but if it's as effective as other geoengineering methods, the

What I mean is bad localized effects in important areas. Painting roofs sounds completely benign, but if it's as effective as other geoengineering methods, then there's little reason to think it doesn't have the risks of other methods. (Personally I think those risks are probably worth taking, given climate tipping points.)