From The Australian:

WAYNE Swan will today move to reinvigorate the government’s carbon tax sales pitch, unveiling Treasury modelling that predicts Australia’s income will be $8000 a person higher by 2020, even with a $20 a tonne carbon price.
The Treasurer – in a major speech aimed at boosting the government’s carbon tax plans and cutting down Tony Abbott’s cost-of-living attacks – will release modelling that shows average annual growth in real national income per capita will be 1.1 per cent until 2050.
The Treasurer will declare that national income will continue to increase under a carbon tax, telling the National Press Club: “This means a carbon price will only reduce growth in GNP per person by about one-tenth of one percentage point.”
The Treasurer will argue that carbon pricing is “the next crucial frontier” in economic reform, likening it to the abolition of tariffs and the introduction of compulsory superannuation.
Arguing that as Treasurer, “I refuse to let this country become an old-world, high-polluting, technological backwater”, Mr Swan will release the modelling showing real national income per capita will be 16 per cent higher than current levels by 2020, an increase of more than $8000.
By 2050, the increase is about 56 per cent, more than $30,000.
“That’s before you take into account the long-term benefits of carbon pricing – like protecting tourism icons such as the Great Barrier Reef or Kakadu, or the agricultural wealth of the Murray-Darling Basin,” Mr Swan will say.
Although the numbers to be unveiled by Mr Swan relate to a carbon price of $20 a tonne, it is understood Treasury has modelled a range of figures and that the government is yet to make a final decision on the starting price.
Mr Swan’s speech comes as the government’s multi-party climate change committee enters its final weeks of deliberations on the shape of the carbon pricing package and before the imminent release of a Productivity Commission report into relative carbon prices overseas.

The rest here.