Again from the TAR:
http://www.grida.no/climate/ipcc_tar/wg3/176.htm
"One of the perennial concerns about possibilities for modifying the
earth's radiation balance has been that even if these methods could
compensate for increased GHGs in the global and annual mean, they might
have very different spatial and temporal effects and impact the
regional and seasonal climates in a very different way than GHGs.
Recent analyses using the CCM3 climate model (Govindasamy and Caldeira,
2000) suggest, however, that a 1.7% decrease in solar luminosity would
closely counterbalance a doubling of CO2 at the regional and seasonal
scale (in addition to that at the global and annual scale) despite
differences in radiative forcing patterns."
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