Australian Greens Leader Bob Brown and the Member for Melbourne Adam Bandt talk to reporters in Canberra about the mining tax, after the Prime Minister's MRRT announcement.

Senator Brown said superannuation taxation arrangements can be made much more socially equitable and the Gillard Government's open cheque book approach to refunding mining companies for royalties paid to states should be reviewed by the Senate.

Adam Bandt also commented on his move in the House of Representatives to amend the McCarthyite Building & Construction Commission bill.