One of the warmest winters on record has helped Australia reduce its annual greenhouse gas emissions.

Winter emissions were cut by 3.1 million tonnes, which is the same as taking 3 million cars off the road, according to a report by The Climate Group. The biggest drop in absolute terms was in NSW, but the biggest in percentage terms was in South Australia.

“There’s been a noticeable decrease in emissions across the four states [the eastern states and South Australia] over winter,” The Climate Group’s Rupert Posner told the press. “Indeed emissions have gone down by about 3 million tonnes or about 4 percent.”

“The last emissions to fall really are in Victoria, where the brown coal generators which are the most greenhouse intensive produce electricity the most cheaply,” Posner is quoted as saying.