Distributed costs and concentrated benefits. Each particular emissions reduction plan impacts specific groups that will fight it. General taxation to pay for ge

Distributed costs and concentrated benefits. Each particular emissions reduction plan impacts specific groups that will fight it. General taxation to pay for geo-engineering projects impacts everyone as well, but not in specific ways. There might be more public support in a moon-shot big engineering project, and fighting the small-government types, than say, reducing emissions for factories and fighting the relevant lobby.