Senator BIRMINGHAM (South Australia) (14:58): Mr President, I ask a further supplementary question. Will the minister heed the warnings of her Labor colleagues with experience in the transport sector, such as Senator Gallacher and Senator Sterle, about the impact of the government's carbon tax on road freight and other transport related costs, or can we expect Labor MPs and senators to behave like lobotomised zombies once the carbon tax is released on Sunday? Honourable senators interjecting— The PRESIDENT: When there is silence on both sides we will proceed. I call the minister.