The DEPUTY PRESIDENT: A letter has been received from Senator Fifield: Pursuant to standing order 75, I propose that the following matter of public importance be submitted to the Senate for discussion: The economic and job prospects that would be lost as a result of the Gillard Government's carbon tax. Is the proposal supported? More than the number of senators required by the standing orders having risen in their places— The DEPUTY PRESIDENT: I understand that informal arrangements have been made to allocate specific times to each of the speakers in today’s debate. With the concurrence of the Senate, I shall ask the Clerk to set the clock accordingly.