Ms JULIE BISHOP (Curtin—Deputy Leader of the Opposition) (14: 40): My question is to the Acting Prime Minister. I refer the Acting Prime Minister to the Canadian Foreign Minister's categorical statement last week that Canada and the United States will not introduce a carbon tax or an emissions trading scheme. Given that the government's modelling of the impact of the carbon tax lies entirely on the introduction of similar schemes across the world, how can the Acting Prime Minister continue to claim the government's modelling is credible, or is he suggesting the Canadian Foreign Minister is wrong?