Bill Clinton is planning to help the Rolling Stones raise awareness about global warming. According to organisers, Clinton is scheduled to appear at a free Stones concert at Los Angeles' Staples Centre on Thursday. The ex-president, who sported sunglasses and played his sax on The Arsenio Hall Show during a 1992 campaign appearance, is not expected to perform with the band. Instead, he'll make a speech from the stage about the importance of fighting global warming, according to the Natural Resources Defence Council - the nonprofit group staging the gig. A spokesman for NRDC said: "The show was conceived as...