Senator BIRMINGHAM (South Australia) (14:56): Mr President, I have a modest supplementary question. Can the minister explain how many other businesses— Honourable senators interjecting— The PRESIDENT: Order! I would ask senators to show respect for the person asking the question by listening to the question in silence. Senator Conroy interjecting— The PRESIDENT: Senator Conroy! Senator BIRMINGHAM: That is the second time you have mentioned him. Thank you, Mr President. Can the minister explain how many other businesses in other industries will face the prospect, in Senator Gallacher's words, of 'going broke or cutting corners' as a result of Labor's carbon tax?