The Anchoress hits one out of the park with this post on how much energy the average music star must use in watts consumed during concerts, exhaust from the 18-wheelers that transport it, and petroleum consumed to make CDs, tee shirts, and other concert-related paraphernalia.
She also links to this article that shows that Hollywood's TV- and movie-making spew more pollutants than "aerospace manufacturing, apparel, hotels, and semiconductor manufacturing" (individually).
Proposed by the Anchoress: that they give up a summer's worth of tours. For the planet, after all. And in return she'll learn to live without them.
Hey, I can get behind that.