The plastics consumed yearly by Australians have a greenhouse emissions impact equivalent to 5.7m cars - more than a third of the cars on Australia’s roads, new analysis suggests.

Kate Noble, the policy manager of WWF Australia’s No Plastics in Nature program, said: “While plastic is not one of the biggest emitters, and the focus on the biggest emitters is absolutely right, it’s also right that we should understand what the impact of our growing plastic consumption is in terms of emissions.”

Over 20 years, plastic made from virgin fossil fuels was 2.2 and 2.7 times more emissions-intensive than mechanically recycled plastic and plant-based plastic respectively, the modelling showed.

Dr Deborah Lau, who leads the CSIRO’s Ending Plastic Waste mission and was not involved in the report, said the analysis “Recognises that carbon emissions should not be the only environmental measure when considering alternatives to plastic products”.