Senator DI NATALE (Victoria—Leader of the Australian Greens) (17:04): I seek leave to make a short statement. The PRESIDENT: Leave is not granted. Senator Di Natale: I would have thought that you'd give me the courtesy— The PRESIDENT: Is leave granted? Leave is granted for one minute. Senator DI NATALE: Just so Senator Roberts understands our reasons for not debating him: a wise man once said, 'Never debate a fool, because they drag you down to their level and beat you with experience.' We will not be debating Senator Roberts; indeed, what we will be doing is continuing to campaign for the preservation of our planet and— Senator Ruston: On a point of order: I think it is unparliamentary for a senator to be calling another senator in this chamber a fool. Senator McKim: On the point of order: Senator Di Natale did not do what Senator Ruston just alleged and asserted that he did. He simply regaled to the chamber a saying, which we are all well aware of, and certainly did not attribute that—being a fool—to Senator Roberts. Senator Ruston: I seek clarification as to whom Senator Di Natale was referring to when he made the statement. The PRESIDENT: Senator Roberts, as the subject, I will take a submission from you. Senator Roberts: It is not worth debating, because, if I had any respect for Senator Di Natale, I would have been offended. The PRESIDENT: I think Senator Di Natale was careful enough with his words to run along the boundary line. I will review the Hansard and come back if the Hansard recorded something different to what I recall. It did grab my attention. I remind senators again—that includes everyone; I am not just referring to Senator Di Natale here—that statements are here to explain positions taken. They are not to inflame debate, otherwise we cascade into difficulty. Senator Waters interjecting— The PRESIDENT: That is why I am making clear, Senator Waters, that I am not referring to the Greens or Senator Di Natale; I am referring to inflammatory statements. This will descend very quickly if that happens, and I remind every senator, including myself—although I haven't done it—that any senator can deny leave for someone to make a one-minute statement. The question is that motion No. 174 be agreed to.