Despite the introduction of more eco-friendly cars such as the hybrid gas-electric Honda Insight, the American car fleet is more destructive to the environment than ever before, spewing record amounts of carbon dioxide, according to an annual ranking of new car models by the American Council for an Energy-Efficient Economy. The 10 most fuel-efficient vehicles in the U.S. account for only 0.1 percent of sales, according to ACEEE, while Americans are buying high numbers of light trucks, including SUVs. A new large SUV emits 50 percent more carbon dioxide than the average vehicle already on the road, the group said.
