Ms GILLARD (Lalor—Prime Minister) (14:15): My response is that there is no getting away from the fact that the cheapest and most effective way of transforming our economy for a clean energy future is through a market based mechanism. Every member of the Liberal Party, including the Leader of the Opposition, went to the 2007 election on that pledge. They believed it then and, indeed, many of them believe it now, even though they have followed the Leader of the Opposition down his cheap and populist path. The SPEAKER: The Prime Minister will return to the substance of the supplementary question. Ms GILLARD: On costs and climate change and making sure that we cut carbon pollution, it is amazing me that today, of all days, the Leader of the Opposition would ask questions about this matter, given the CSIRO, through its researcher, has today debunked his climate change policy as absolute nonsense. The SPEAKER: The Prime Minister will return to the substance or will resume her seat. Ms GILLARD: We are determined as a government to pursue the least-cost mechanism for change. The Leader of the Opposition is determined to ask working families to pay $1,300 for his costly, wasteful scheme. The SPEAKER: The Prime Minister will resume her seat. Mr Pyne: Sat down again! The SPEAKER: Last sitting Thursday, the member for Sturt said it was too long since his last ejection from the chamber. I may well remedy that.