California is taking another step to make car buyers more aware of how their car affects the planet this year. All new car models will bear an Environmental Performance sticker that rates the car based on smog and global warming emissions. With both ratings, the higher the score on a scale of 1 to 10, the more eco-friendly the car.



The global warming rating is based on the amount of greenhouse gas emissions per mile. A score of 1 equals 520 CO2 grams per mile while a score of 10 equals less than 200 CO2 grams per mile. The emission calculations include production and distribution of the fuel used in the car.



For those of us outside of California, the smog scores are available at DriveClean with the global warming scores to be added. Hybrids and electrics are the top scoring vehicles listed, with the slick (and expensive) Tesla Roadster having the best score.