About 1,600 tonnes of Voluntary Emission Reductions (VERs) changed hands, opening at A$8.50 per tonne for 2007 and closing at A$8.60. The total value of the trades was A$13,610, according to data on ACX's website http://www.climateexchange.com.au/

This compared with prices of 19.50 euros (US$26.96) for European Union carbon emissions on the ECX exchange for delivery in December 2008, the first year of commitments under the UN Kyoto Protocol on climate change.

Australia has not ratified Kyoto, which sets binding limits on emissions and envisages global emissions trading, but Prime Minister John Howard has pledged to establish a national carbon trading scheme by 2012.

The ACX exchange is the fourth voluntary market, following schemes in the United States, UK and Japan.

ACX Limited Managing Director Tim Hanlin said businesses wanted an opportunity to sponsor clean technology now.

"This is a voluntary emissions trading market and it's business to business trading of greenhouse gas emissions," Hanlin told Australian Broadcasting Corp. (ABC) radio. Carbon trading involves putting a price and limits on pullution, allowing companies that clean up their operations to sell any savings below their allocated level to other companies.

ACX is a joint venture with companies trader Australia Pacific Exchange.

(US$1=1.133 Australian Dollar)