The Australian Greens have today released Parliamentary Budget Office costings that show removing structural unfairness in the tax system through the discount on Capital Gains Tax (CGT) could generate as much as $74 billion over the next ten years, rising to $127 billion when negative gearing reforms that have warped the housing market are taken into account.

Increasing numbers of homeless people - the ugly side of the $1 million price tag for a Sydney home - require fast tracking far reaching reforms to negative gearing and capital gains tax, Greens NSW Senator Lee Rhiannon said today.

"The Sydney housing crisis should be a top priority of the NSW and federal governments," Senator Rhiannon said.

"Prime Minister Tony Abbott should speak up for those in his home city who are doing it tough with no relief in sight for secure housing.

The Australian Greens have welcomed the Reserve Bank of Australia's call for a review of negative gearing and capital gains tax, with Senator Scott Ludlam today saying Joe Hockey should have a serious conversation about ending unnecessary and unfair tax breaks.

"The RBA's announcement sends a clear signal to Joe Hockey and Tony Abbott to get out of the way of a real discussion about structural unfairness in the tax system," Senator Ludlam, Australian Greens acting leader said.

The Australian Greens said today that the federal government to move to ban the Clean Energy Finance Corporation from investing in small scale solar will impede WA's rapid uptake of rooftop solar and impact local businesses.

"Researched released by the Greens shows that the number of WA homes with solar photovoltaic (PV) power has increased 19% in just one year - overwhelmingly in outer suburbs and households with lower incomes," Senator Scott Ludlam, Australian Greens acting leader said today.

The Australian Greens said today that Tony Abbott and Joe Hockey should learn a negative gearing lesson from their conservative counterparts in the UK.

"The UK's Tory government is winding back negative gearing, while Australia's Tories are too afraid to even have a conversation about the reforms," Senator Scott Ludlam, Australian Greens acting leader and housing spokesperson said today.

Senator RHIANNON (New South Wales) (19:37): On another matter, the Liberal Premier, Michael Baird, is seen as the fresh face of the can-do leader of Australia's biggest state. But when you look behind the smiles and the spin, this regime is looking more and more like another Liberal government that is rarely talked about in Liberal circles.

Senator RHIANNON (New South Wales) (15:56): I move: