The Greens will establish a Green Buildings fund to harness the massive opportunity to reduce carbon pollution and create healthier places to work.

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.

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.