As for geoengineering, there have been serious general critiques that I think cannot be ignored, like Clive Hamilton's, along with many positive assessments. It is not a matter for subjective judgment based on guesswork and intuition. Rather, these are matters that have to be considered seriously, relying on the best scientific understanding available, without abandoning sensible precautionary principles.
The role of geo-engineering should, in a world of responsibility, in a world of scientifically enlightened decision making and ecological understanding, it should be zero. There is no role for geo-engeneering. Because what is geoengineering but extending the engineering paradigm?
Geoengineering means changing the Earth's fundamental large-scale processes.
To be clear, geoengineering won't solve global warming. It's not a 'techno-fix. ' It would be enormously risky and almost certainly lead to troubling unforeseen consequences.