The uk's department of transport has launched a website designed to let car buyers choose the most environmentally friendly vehicle. The site, qww.dft.gov.uk/ActOnco₂, allows buyers to search models by category, transmission and fuel type. It then provides them a list of the lowest co₂ emitting models. "By choosing the car with the most fuel efficient engine in its class, drivers could reduce the co₂ emissions of their engines by 24 percent and save a quarter on fuel costs,' uk's transport minister Jim Fitzpatrick said.

The rankings were developed using emissions data from the Vehicle Certification Agency, the body responsible for conducting official tests on co₂ emissions.They were developed by What Car? magazine, based partly on groupings used by the motor industry to classify cars and partly on surveys.