The European Union’s environment agency published new data on Wednesday showing that the average CO2 emissions of new cars registered in the EU and UK has increased for a second consecutive year in 2018, hitting 120.8 g/km, an increase of 2 g.

Carmakers have been warned that they must increase their efforts face fines, or to fulfill with stringent emissions targets.

The purpose is to slash emissions by 27 percent compared to 2018 levels, with 2020 targets set at 95g/km on average for new cars.

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“Manufacturers will need to improve the fuel efficiency of the fleet and accelerate the deployment of zero- and low-emission vehicles,” said the European Commission.

The rise in average emissions in new cars was allegedly caused (mostly) by the continuing shift away from fuel-efficient diesels to gasoline-powered cars, with the share of diesel fleets dropping by 9 percent, reports Autonews Europe. While diesels accounted for 36 percent back in 2018, 60 percent of new cars were petrol.

This change in emissions is also thought to have been affected by changing consumer preferences, as buyers began to optThe goal is to slash emissions by 27 percent compared to 2018 amounts, with 2020 targets set at 95g/km on average to get bigger and heavier gasoline-powered SUVs.

“New registrations of zero- and low-emission cars rose in 2018 but represented only around 2% of new car registrations, compared to 1.5 percent in 2017,” added the Commission.

Slimming CO2 emissions is among the EU’s biggest challenges. The Union would like to become climate-neutral from the year 2050. The Commission is currently considering even targets for auto pollution and an extension of the region’s carbon market to be able to cover road transport.