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10 alternatives to the gasoline-powered engine

There's no shortage of greener ways to run a car. How viable they are is another story.

1. Gas-electric hybrids

2. Plug-in hybrids

3. Electrics

4. Ethanol and flex fuel

5. Biodiesel

6. Propane

7. Liquefied and compressed natural gas

8. Fuel cells

9. Solar

10. Steam