Senator ROBERTS (Queensland) (16:38): I seek leave to make a short statement. The DEPUTY PRESIDENT: Leave is granted for one minute. Senator ROBERTS: We will be opposing this. It's a shame Senator Di Natale is not here, because on 20 September a Victorian arborist called my staff to say that when he listens to Senator Di Natale talking about climate change it sounds like a 50-year-old trying to convince us that Santa is real. The first step in dealing with this topic is telling the truth about science and relying on solid empirical data. Firstly, no specific empirical scientific evidence has ever been presented to prove that carbon dioxide from human activity affects climate. Indeed, during 2009's global recession, human carbon dioxide output fell, yet atmospheric carbon dioxide levels continued to rise. Any measure cutting human carbon dioxide would be useless because, secondly, each year nature produces 32 times more in total than does global human production. Even the UN climate mob admits this. Thirdly, the laws of physics, chemistry and empirical data show nature alone controls the level of carbon dioxide in the air. Day 37 and still waiting— (Time expired) The DEPUTY PRESIDENT: I remind you that it's not appropriate to reflect on whether senators are in the chamber or not. The DEPUTY PRESIDENT: The question is that general business notice of motion No. 191, standing in the name of Senator Di Natale, be agreed to.