12 'meanest' cars environmentally in 2013

Some cars are environmental terrorists.

Here are 12 of the "meanest" cars as ranked by, using its Green Score index. analyzes vehicles with a measure that incorporates tailpipe emissions, gas mileage and gas emissions that contribute to climate change. The scale goes from zero to 100, with a lower score indicating a car with more environmental impact.

Miles per gallon, specifications and the Green Score are from The Manufacturer's Suggested Retail Price is from the carmaker or

Bugatti Veyron 16.4

Model starting MSRP: $2.25 million (from Car and Driver magazine)

Specifications: 8-liter 16-cylinder engine with manual transmission and all-wheel drive; uses premium gas
8 mpg city/15 mpg highway
Green Score: 19


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