Mr HOCKEY (North Sydney) (14:37): My question is to the Treasurer. I refer the Treasurer to last week's G8 meeting, at which Russia, Japan and Canada advised that they would not join a second round of carbon cuts under the Kyoto protocol and President Obama restated the United States's opposition to the Kyoto protocol. Has the Treasurer commissioned Treasury modelling on the effect on our economy if Australia moves ahead of our major trading partners by introducing a carbon tax?