[Skybird]

While he may be right in hinting at Volcanic activity having brought much higher ammounts of dust, ashes and sulphur into the atmosphere, the problem I have with it is that if the calculations prove to be wrong and adding to our porblems instead of redcuing them, the project nevertheless would be irreversible. that is a risk, as a matter of fact.

I would prefer to deflect solar energy by space-based installation, maybe huge fields of foil that eventually could even be used as solar energy collectors. Of course - the costs would be immense. But the costs of climate change will be immense anyway: either for adapting to it, or for dealing with the consequences that we allowed to catch us unprepared.