Beyond the accuracy of the Sulfur aerosols theory, the interesting part in the linked video is the stuff about geoengineering.

Which basically said that if aerosol pollution was accidentally keeping the planet relatively cool and so holding off climate change which is actually at a worse level than we thought, then it raises the unavoidable point of whether we’ll be forced to continue to employ geoengineering in our fight against climate change however uncomfortable and dangerous the prospect is.

Green’s opinion on the video is that there’ll be a lot of resistance but that we’ll probably be directed to in the end and so the more we prepare and think about it the better.