Senator CORMANN (Western Australia) (14:18): Mr President, I ask a further supplementary question. If the minister really stands by the budget estimate of a $29-a-tonne carbon price in 2015-16, why then did the government decide to remove the $15 floor price on carbon? Is it not the case that the government is well aware that this decision to drop its floor price on carbon is contributing to Labor's $120 billion budget black hole, which comes on top of its $174 billion in already accumulated deficits?