Motoring experts have warned new car tax changes need to be "measured and sensible" for drivers.
Proposals from the UK Energy Research Centre (UKERC) hope to introduce a gradual tightening of tax between 2021 and 2030.
Under the new idea, those purchasing models emitting more than 225gCO2/km would face a 50% purchase tax starting next year.
It is believed the plan could save 32 metric tonnes of Co2 between 2020 and 2030 if it goes ahead.
However, experts are now warning these new changes could "backfire" and become an issue for some road users.
Also car tax increases would need to be considered to ensure drivers make sensible decisions for the environment and their costs.
Alex Buttle, the director of Motorway.co.uk, warns these tax hikes could become an issue for some road users.
He told Express.co.uk : "We are fully behind the 2030 switchover to electric cars.
"But any tax hikes on those who have not yet bought electric need to be measured and sensible.
"This is to ensure the public can make sensible decisions for both the environment and their wallet."
The new policy could see the most polluting models emitting 225g Co2 per km charged at the point of purchase from next year.
But some models would continue to be introduced on a sliding scale for each preceding year.
By 2030, only zero-carbon motors would avoid the tax which could see thousands slapped with higher costs when buying a car.
The UKERC says the new policy would help lower emissions between the medium to long term.
Professor Rob Gross, a UKERC spokesman, said: "You might think that people not buying cars is a good thing for the environment.
"But it's not a good thing if they delay buying a relatively inefficient car, and that car is still being used for longer.
"Every gram of CO2 that enters the atmosphere stays there, potentially for hundreds of years."
This year, sales of electric vehicles have increased with a 162.2% jump in 2020.
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