The Environmental Transport Association has looked at over 1300 models of car currently on sale in Britain and examined their power, emissions, fuel efficiency and even the amount of noise they produce to create the definitive guide to buying the greenest vehicle.

The Car Buyers’ Guide was first published by the ETA in 1992 in response to requests from its growing membership and has since become the environmental benchmark for the car industry and the public, championing the greenest cars in Britain.

The results for 2008 are as follows: