Senator SINODINOS (New South Wales) (14:21): Mr President, I ask a further supplementary question. Given that the government's mining tax revenue estimates for the current forward estimates have plummeted from $22.5 billion when the mining tax deal was signed to $13.4 billion in the most recent budget forecast, to $9.1 billion in MYEFO— Senator Conroy interjecting— Senator SINODINOS: and you know this is true, Senator Conroy; you know this is true—what action will the government take to offset the revenue impact on the budget if there is a further slippage?