A very shiny Cadillac with a chrome “ELR” badge on the back is parked outside the Fortune Brainstorm Green event. ELR, because this is an electric Cadillac sports coupe. As I drove to the venue from the Los Angeles airport, I spotted Chevrolet Volts, a Nissan Leaf and even a few of the new Tesla Saloons. To me this was a visible sign of the major changes that are taking place as energy efficiency is put at the heart of more and more industries. For ARM, it’s been at the core for decades, putting us in a fantastic position today. Fortun...