Britain's greenest cars

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Greenest Executive and Luxury Car: Saab 9-5 BioPower

This Saab has the potential to out-green any of the winners here. On sale in the UK now, the specially adapted 9-5 can run on bioethanol distilled from plant matter, turning the CO2 dilemma from a vicious circle into a virtuous one.

It still emits carbon at the same rate as when it's running on petrol, but rather than adding to the sum of greenhouse gases, the carbon dioxide released is merely what the plants used to make the fuel soaked up in the first place.

Other than searching for biodiesel fuel, the driver does nothing differently. At just £600 extra, the sharply styled new 9-5 is a sleeper here just now. More Government incentives and filling stations could be enough to wake it.
Price: From £21,651
MPG: 32.8
CO2 emissions: 204g/km

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