I thank the member for Flinders for his question. I have been studying material written by the member for Flinders, and it makes interesting reading. I found this article from 20 May 1990, ‘A tax to make the polluter pay,’ by Greg Hunt and Rufus Black. It made very interesting reading. In responding to this question from the member for Flinders, I want to let him know that I tracked down that article from 20 May 1990 because he cited it as a source in his thesis, would you believe? ‘Hunt on Hunt’—that is how he sourced his thesis.