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In the present case, however, there's no conflict between expectation and risk. As best I understand it, the negative effects of unchecked warming also produce what seem to be far greater risks -- setting positive feedback loops in motion, changing weather patterns, possibly switching off the Gulf Stream...
Words and ideas I offer here may be used freely and without attribution.
As it happens, we already know the consequences (smog, acid rain, global temperature drop if scale is large enough) of a massive SO2 release, as you have pointed out. So the modeling should not be too fraught with uncertainties.
Carbon sequestration, which is on everyone's lips these days, is a most likely a problem with more uncertainties--how carbon dioxide will affect subterranean rocks and soils; question of leakage and release after a few hundred years, etc.
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