British motorists who drive gas-guzzling cars could be penalised with higher road tax rates.
The British government is looking at increasing vehicle excise duty for higher-polluting cars in an attempt to put motorists off buying cars that cause the most damage to the environment if they are made more expensive.
A spokesman for the Department of Transport said: "We are looking to see how we can use Vehicle Excise Duty to better reflect carbon dioxide emissions."
Currently the duty on a Lamborghini Murcielago, the highest-polluting car on sale in Britain is £160 a year, just £75 more than for a diesel Renault Clio.