If you compare only standard gasoline and diesel cars, then you have a nasty trade-off today. Which do you prefer, climate change or direct health problems? I am eagerly waiting for clean diesels.
Gasoline-electric hybrids are a strong alternative today, with low CO2 emission levels and low other emission levels (I know the Prius has low other emission levels at least).
Then there is a multitude of alternative fuels that exist and are being researched upon. Here in Sweden, you can today use ethanol and biogas to propel cars. These cars get excellent CO2 and other emission levels. What is nice about ethanol cars is that they are not more expensive than gasoline cars.
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