Because he's a dinosaur, singing a dinosaur song. He went on the Daily Show, or Maher, and defended the anti-global warming "science." He's just another insider espousing an industry that used to kill 50,000 a year, now kills 30,000 with far more passenger miles-- because of "regulation," and I'm sure fought regulation on emissions, and thinks a zero-emission car is a pipe dream. He thinks he's a "realist."
That said, I don't think the end result will be an auto division of Apple. Apple Motors? I doubt it. Self-driving? Maybe. Electric, yes. They do have all those solar farms, and the entire company -- in the US, at least -- will work on solar. Propulsion systems by Apple? Guidance? Batteries? I don't know.