geoengineering as a concept operates with a High Modernist ideology, and overwhelming confidence in humanity's ability to reshape the natural world, society, the State, in a desired fashion. i think relying on policy and markets and the state makes sense public works cleanups, removing tax breaks and subsidies for industries that produce externalities, restructuring labor into environmentally-minded industries and sectors....but i'm ultimately skeptical of a technological fix, sprinkling oceans with lead or growing mass plankton farms or whatnot. sounds like snake oil to me.