Neither of these reduce greenhouse gas concentrations in the atmosphere and I'd be concerned that rather than being used as an extremely short-term fix while we reduce emissions they would just become a band-aid to continue business as usual.
The problem is that once we go down that path we'd have to do it permanently, and if we were ever unable to keep up the release of aerosols or the maintenance of the solar umbrella etc. then the temperature would rapidly soar to wherever it would have been in their absence.
It just seems incredibly high-risk and avoids actually solving the root problem. I saw such geo-engineering described as "a band-aid on a bullet wound" which seemed quite apt.
The problem is that once we go down that path we'd have to do it permanently, and if we were ever unable to keep up the release of aerosols or the maintenance of the solar umbrella etc. then the temperature would rapidly soar to wherever it would have been in their absence.
It just seems incredibly high-risk and avoids actually solving the root problem. I saw such geo-engineering described as "a band-aid on a bullet wound" which seemed quite apt.