The difference is that geoengineering affects the commons. I don’t mind people doing things to their own bodies, I do mind them messing with my atmosphere.
1. Industrial civilizations have been using the sky as an open sewer for emissions. Before that it was soot and lead (TEL).
2. No quick fixes with solar shades, adding chemicals, or fractioning air gases (good luck with scaling that). Get the carbon out of the air by growing stuff and sequestering it at the bottom of the ocean.
