which are the best car for global warming and the worst car?

Answer 1

An electric car getting power from a nuclear, solar, or wind powered power plant.

It's a system, not a car.

Answer 2

Some project and prototype cars run entirely on solar power and produce zero emissions. There are also electric vehicles which themselves produce no emissions but generating the electricity in the first place did - same with biofuels, running a car on them is clean but they produce greenhouse gases in the growing stage.

Of standard production cars the Honda Insight produces the lowest emissions at 80g per kilometre, the Toyota Prius produces 104g, Citroens in the C1, C2 and C3 range are next. The whole league if low emission vehicles is dominated by the Japanese and French.

The worst vehicles will again be non production models such as racing cars, dragsters, rocket powered cars and others that measure fuel consumption in gallons per mile. Of standard production models the most polluting vehicle is the Dodge Ram SRT10 pickup, the most polluting car is the Bentley Arnage, the most polluting sports car is the Lamborghini L-147/148 Murcielago.

As you'd expect, the most fuel efficient and least polluting are the hybrids and LPG vehicles. The worst offenders are the top of the range luxury and sports car models.