Edward Norton might seem shy. Standing in the SDG Media Zone at the UN Headquarters in New York, his gaze skitters away from the cameras. The blue denim shirt, the gray jeans, the wiry frame, and that raspy voice—all of it conspire to render him nearly invisible, as though he’s trying to fade into the background. But when he steps up to the podium, the shift is immediate. A switch flips. The fourth wall rises, and suddenly his quiet presence fills the room, illuminating the causes he champions. Enter biodiversity—a word that might dissolve into academic white noise for most, but for Norton, th…