The Australian Greens' efforts to secure a fairer mining tax have so far resulted in another $140 million for the public purse, to offset the $100 million that MP Andrew Wilkie arranged with the Gillard government to hand back to mining companies, Greens Leader Bob Brown said today.

The Australian Greens are proposing amendments to the watered-down mining tax which are revenue positive and the Gillard Government should ensure that the revenue from the tax is not further undermined.

Australian Greens Leader Bob Brown and Member for Melbourne Adam Bandt outlined the Greens' position on the MRRT, namely to protect the revenue stream from moves in Parliament to further water down the mining tax.

The Greens will also move for a debate on setting a date for a safe exit of Australian troops from Afghanistan.

Australian Greens Leader Bob Brown spoke to reporters in Canberra today to wish the soldiers wounded in Afghanistan a speedy recovery and to call for all Australian troops to be brought home safely.

Senator Brown also answered questions about the passage yesterday of the climate bills, the proposed mining tax, and the activities of Malaysian logging company Ta Ann.

Australian Greens Leader Bob Brown spoke to reporters in Canberra today to wish the soldiers wounded in Afghanistan a speedy recovery and to call for all Australian troops to be brought home safely.

Senator Brown also answered questions about the passage yesterday of the climate bills, the proposed mining tax, and the activities of Malaysian logging company Ta Ann.

Australian Greens Leader Bob Brown and Deputy Leader Christine Milne, flanked by other Greens senators, speak to reporters outside the Senate chamber immediately after the passage of the climate bills.

The Australian Greens are celebrating the historic Senate vote for world-leading legislation to tackle the global nemesis of climate change.

Australian Greens Leader Bob Brown congratulated Greens Deputy Leader Christine Milne and the Gillard government for giving Australia a real breakthrough in tackling that nemesis of climate change.

"People 50 years, or 500 years, from now will thank us for doing this," Senator Brown said.

Greens Leader Senator Bob Brown spoke to the media this morning about the historic passage of the carbon price legislation, he paid tribute to the work of Greens Deputy Leader and Climate Change spokesperson Senator Christine Milne.

Australia is closer than ever to a clean energy future, with the bills to put a price on carbon and invest in clean, renewable energy being debated in the Senate. These bills, which wouldn't have happened without the Greens, are a vital first step to tackle the climate crisis and transform our economy.

These are the speeches made by the Australian Greens' MPs during the debate of this historic legislation.