As I understand from reading discussions on the net, the CERN report suggests a possible mechanism by which the sun can affect galactic cosmic radiation on earth which in turn affects cloud formation.
Well, not entirely. At least, not what I gather from the net. At least, the report doesn't draw any conclusions about cloud formation. What they tested for was if cosmic rays could nucleate small particles. They found this to be the case, yet they never tested if these nucleated particles would lead to cloud formation. So, yes on the nucleation, no on the cloud formation. At least, not from this report.
Here's a video on it, also criticising the media's/bloggers handling of this news, and science news in general:
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