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Here's an interesting article from Scientific American: "Can Climate Intervention Turn Down the Heat?" Some researchers from Carnegie Mellon created a climate model of Earth and observed the affects of global warming in over time. They then introduced climate intervention techniques such as satellites supporting mirrors or particles dispersed in the sky to reflect the sun's rays.
They made the assumption that whatever intervention technique was chosen the affect would be uniform across the globe. That seems like an unrealistic assumption, but without that assumption it would've been pretty hard to model, so I can understand why they did it. Anyway, read the article for their interesting results.