Of course the folks at RealClimate would take on the BBC "Global Dimming" story, and give it the kind of examination we've come to expect from the professionals. They now have two articles up, both well-worth reading. The first, aptly titled "Global Dimming?," takes on the concept in general, has a number of pointed comments about hack sensationalist journalism, and discusses what it means when scientists are uncertain. The second, Global Dimming II, looks at the history of the idea of global dimming and what might be causing it. A good pair of posts, nicely explaining the ideas.