AAP: AUSTRALIA is trailing the rest of the world in climate change policy and risks becoming uncompetitive, a leading climate change economist says. “There is no risk of Australia taking a leadership position,” said Cameron Hepburn, a senior research fellow at the University of Oxford. “We are so far behind the post we risk coming last.” The G20 emerging nations, especially China and India, had already taken strong steps, Dr Hepburn told a mining conference in …