British racing green could take on a whole new meaning if Bentley is able to achieve its goal of reducing CO2 emissions by two-thirds to just 120 grams per kilometer by 2012. Currently, all of its vehicles emit more than 400 g/km, no doubt including the 2009 Bentley Brooklands we drove last week, so the company from Crewe has a long way to go. While we'd expect to see some sort of diesel offering, Bentley remains mum on any real details regarding its future powerplants. We do know, however, that the British manufacturer of ridiculously luxurious transportation is holding out hope for biofuels, which post high well-to-wheel CO2 measurements. When just the tailpipe emissions are taken into consideration, biofuels offer just a little benefit as compared to dino-juice, but when the entire carbon footprint of the fuel is considered, biofuels like ethanol and biodiesel can post significant CO2 improvements.

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