Senator BOB BROWN (Tasmania—Leader of the Australian Greens) (14:24): Mr President, I ask a supplementary question. Is the minister aware that last night Mr Warburton told ABC Business Lateline: Well, I am a sceptic. I've never moved away from that. I've always believed sceptical. But a sceptic is a different person than a denier. I say the science is not settled. I'm not saying it's wrong. I've never said it's wrong, but I don't believe it's settled. Is Mr Warburton wrong or right in that, and can the minister trace the impact of Mr Warburton's advice as political adviser on the sceptical Leader of the Opposition? (Time expired) The PRESIDENT: Senator Wong, again, as you are representing the Minister for Climate Change and Energy Efficiency you only need to respond to those parts of the question that pertain to your portfolio.