If you've got a favorite European automaker, you can now find out how dirty their cars are. R.L. Polk conducted a study on automakers average CO2 emissions for 2005 vehicles relative to other brands and to their own 1997 cars. The study found that Fiat was emitting the least (139 grams of CO2 per kilometer, on average) and Volvo was the worst (195 grams). The BBC has ranked the manufacturers by percent of a voluntary 2008 target achieved rather than by the more useful average CO2 emitted per kil
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