Automakers selling cars in the EU may face tougher CO2 emissions reduction targets after the European Commission signaled it will review goals already set for 2030.

The Commission will propose to revise by June 2021 legislation on CO2 emission standards for cars and vans “to ensure a clear pathway from 2025 onwards towards zero-emission mobility,” it said in a document called the European Green Deal, Automotive News reads.

In April, the European Union passed legislation that mandates automakers selling cars in Europe to cut their average fleet CO2 emissions by 37.5 percent by 2030 to 60 grams per km relative to a 2021 baseline of 95 g/km. In 2018, emissions from new cars increased for the consecutive second year, rising to 120.4 g/km.

The new European Commission presented its long-term roadmap for a climate neutral EU economy on Wednesday. Commission President Ursula von der Leyen has put climate action at the top of her legislative agenda for the next five years.

“The Commission is within its mandate to propose a new target, but any such step would come with the requisite economic impact assessment and require approval from the EU Parliament and EU Council to enter into legislation,” a Commission spokeswoman said.

She declined to comment on whether a 15 percent intermediate CO2 emissions reduction target for 2025 could also be reviewed.

The emissions reduction targets are part of the EU’s commitment to tackle climate change by moving to carbon neutrality by 2050.  As a result, it is not uncommon for Brussels to re-evaluate whether targets were proving effective for achieving policy goals, and adjust them where necessary, the spokeswoman said.