The government has launched a new initiative which aims to help drivers make an informed choice when buying a new car.
A website named ACT on CO2 has been set up on which drivers can compare the emissions of different cars and choose a more fuel efficient vehicle.
It is hoped that the site will not only save drivers money but also help to protect the environment by reducing carbon emissions.
Transport minister Andrew Adonis said: "This campaign shows how the choices we make when buying a new car can have a big impact on future fuel costs and emissions, as well as the road tax we pay.
"By using the ACT ON CO2 search tool, buyers can choose the most fuel efficient cars and see the savings on the screen in front of them."
He added that he hopes the site will see more people and businesses opting for greener cars at the same time as supporting the motoring industry and "stimulating widespread environmental change."
Meanwhile, car maker Toyota has unveiled plans to build a solar powered car.
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