Ethanol - Can be produced from plant material so is know as a biofuel. It's made by fermentation of plants and is used to power cars in some places. It's often mixed with petrol to make a better fuel.
Pros: The carbon dioxide when it's burnt was taken in by the plant as it grew, so it's 'carbon neutral'. The only other product is water.
Cons: Engines need to be converted before they'll work with ethanol fuels. And ethanol fuel isn't widely available. There are worries that as demand for it increases farmers will switch from growing food crops to frowning crops to make ethanol - this will increase food prices.
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