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Key Findings, by Automaker:
Honda retains its title as the Greenest Automaker. Honda has the best smog performance in four out of the five classes of vehicles it produced, and better-than-average global warming scores in every class.
Toyota is nipping at Honda's bumper. Toyota is the only major automaker to consistently improve global warming performance since 2001, thanks to hybrids and better conventional technology.
Hyundai-Kia wins bronze in its debut appearance. Hyundai-Kia's vehicles have better-than-average performance on both smog and global warming pollution.
Nissan slips from its second-place finish in our last ranking. Nissan could have made the top three had it not taken advantage of a loophole that artificially inflates fuel economy ratings for dual-fuel (gasoline/ethanol) vehicles.
Volkswagen's vehicles disappoint. VW cars are some of the dirtiest, when compared with others in the same classes. Cleaner diesel and gasoline vehicles are a key to future success.
Ford is the best of the worst. Ford could have tied for third place on global warming performance if it had matched the reductions in global warming pollutants it has achieved in its European fleet since 1997.
General Motors crawls out of the basement—barely. GM is the top peddler of vehicles rated at 15 MPG or worse in city driving.
DaimlerChrysler is Public Polluter #1, with the worst global warming performance in half the classes in which it produces vehicles. Its small pickup trucks produce more smog than any class of vehicles from any other automaker.
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