Australia, with the highest per capita greenhouse emissions of any large developed country, will soon take on one of the most ambitious schemes to tackle climate change, with a new carbon-trading system.

The planned carbon tax will start in 2012 and apply first to the 500 worst polluting companies responsible for about 60 percent of the country’s emissions, making it the largest carbon market outside of Europe. Rates will start at 23 Australian dollars per tonne of carbon (US$24.20 per ton), higher than prices have been on the European emissions market for the past couple of years.

The carbon prices would gradually rise, and then the government would transition in 2015 into a cap-and-trade