The ACTING DEPUTY PRESIDENT ( Senator Crossin ) (16:32): 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 Government's determination to exacerbate cost of living pressures for Australian households through the introduction of the world's biggest carbon tax on 1 July Is the proposal supported? More than the number of senators required by the standing orders having risen in their places— The ACTING 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 clerks to set the clock accordingly.