The transport sector has been identified as the fastest growing culprit in the greenhouse gas sector by one expert.
According to WhatCar, motorists have an environmental responsibility to consider the environmental impact of their cars and the body urges them to make use of the various rating systems on the market.
WhatCar particularly advocated using its own in-house ratings review, which covers 20,000 cars whether old or new.
WhatGreenCar.com extends its analysis beyond the original Cleaner Drive method and takes into account the car manufacture and assembly cycle to give a score of between zero and 100, with the lowest outcome the better.
The firm said in a statement: "With vehicle emissions contributing to the increasing concentration of gases leading to climate change, car drivers are becoming more environmentally aware.
"The WhatGreenCar.com rating system looks at the running impact but, in addition, it also takes into account the vehicle's whole lifecycle."
Earlier this month, Nissan revealed its first all-electric vehicle, the Leaf, at its headquarters in Yokahama, Japan.
The car is billed as being capable of travelling distances more conducive to everyday life without needing to be recharged and affordable, although exact pricing details have not yet been revealed.
Nissan bosses expect the car to be priced in the range of a well-equipped C-segment vehicle.
"We have been working tirelessly to make this day a reality - the unveiling of a real-world car that has zero - not simply reduced - emissions," said Nissan's president and chief executive officer Carlos Ghosn.
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