Senator IAN MACDONALD (Queensland) (14:55): My question is to Senator Wong, representing the Minister for Climate Change and Energy Efficiency. Is the minister aware of detailed modelling on the carbon tax, released yesterday by respected modellers ACIL Tasman, which shows that six black-coal mines in my home state of Queensland are at risk of closing? Is the minister also aware that the Queensland economy stands to lose almost $13 billion in revenue from the loss of proposed coalmines as a result of the government's carbon tax? How can the minister justify this carbon tax and that loss of revenue to the Queensland government and indeed to Queenslanders generally?