http://www.economist.com/node/17414216

This seems like a reasonable article, although I think they don't sufficiently highlight the (perhaps obvious) point that one really has no clear idea of the knock-on consequences of geoengineering.

The comments to the article are better than usual: Not too many skeptics that are completely rabid. If someone likes to debate these points in blogs, this might be a better-than-normal site for discussion.