What do people do when they have more money? You think they'll be eager to spend it on insulation retrofits and ground-source heat pumps? In our fossil fuel-powered economy, I think they'll buy more stuff and travel more, and most of those activities will increase GHG emissions.

I'm not arguing against measures to decrease wealth inequality. But is the sum of (potentially richer) individuals' actions likely to address climate change in a better way than a hypothetical billionaire's geoengineering project? I'm not convinced in either direction.