Polestar says it is currently impossible for a consumer to compare the climate impact of different cars.
"The industry has a transparency problem," said Polestar Head of Sustainability Fredrika Klaren.
Polestar discovered the issue when it was developing its methodology to determine the carbon footprint of its first full-electric car, the Polestar 2 sedan, which the Volvo Cars subsidiary estimates leaves the factory with a carbon footprint of 26 metric tons.
"It became so clear to us that consumers can't do anything with this number because they can't compare it," she told Automotive News Europe during a video chat. "Automakers aren't sharing their methodologies. And if they are they certainly aren't sharing them with customers."
Polestar calls out industry’s carbon footprint 'transparency problem'
Polestar has done an analysis of the Polestar 2's life cycle carbon footprint, which ranges from 27 metric tons to 50 metric tons of CO2 depending on the source of the electricity used to charge the Tesla Model 3 challenger.
The details
Click here for the methodology for Polestar’s Life Cycle Assessment and an analysis of the Polestar 2's carbon footprint
Polestar did get one automaker to share information: its parent company. That is how the 3-year-old brand determined that the Polestar 2's carbon footprint was 10 metric tons more than the gasoline-powered version of its platform mate, the Volvo XC40, at the end of production.
The biggest contributors to the difference are the Polestar 2's battery module and its usage of aluminum, which each contributed 29 percent toward the sedan's carbon footprint from materials production. That amounts to 15 of the Polestar 2's 26 metric tons of CO2 during production.
After the EV reaches the customer, however, it's carbon footprint diminishes to 1 metric ton (27 metric tons in total) over an estimated life cycle of 200,000 km -- as long as it is recharged solely with renewable energy sources such as wind power.
If coal or other CO2-producing methods of generating electricity are used, the Polestar 2's life cycle carbon footprint ranged from 50 metric tons to 42 metric tons. The XC40's life cycle carbon footprint is 58 metric tons, according to Polestar's calculations.
"There is a lack of trust due to old, non-transparent ways, for instance Dieselgate," Polestar Head of Sustainability Fredrika Klaren.
"We aren't saying our methodology is perfect, we just want the information to be open and shared so consumers can make conscious decisions," Klaren said, adding that Polestar believes the transparency will help the industry's dented reputation when it comes to emissions.
"There is a lack of trust due to old, non-transparent ways, for instance Dieselgate," she said, referring to the Volkswagen Group's diesel-emissions cheating scandal that was made public five years ago this month.
VW has paid more than 30 billion euros in fines, settlements, recalls and legal costs for equipping 11 million vehicles worldwide with manipulated engine management software to cheat diesel pollution tests.
This week Daimler said it would pay $2.2 billion to resolve a U.S. government diesel-emissions cheating investigation and claims from 250,000 U.S. vehicle owners.
Klaren said that Polestar aims to gets its carbon footprint down to zero by 2040 or earlier without committing to a target. "We are uncompromising in being progressive," she said, "so expect us to have a really ambitious target compared to other automakers."
Volvo Cars aims to be climate neutral by 2040. To get there it will need to slash its life cycle carbon footprint by 40 percent to 31.8 tons of CO2 per car by 2025 from 53 tons in 2018.
