Bio diesel
The oil -- waste vegetable oil (WVO), used fryer grease, animal fats, lard -- is often free for the taking.

All you need is a few common chemicals and some equipment you can easily buy or make yourself.

The result is a cheap, clean-burning, non-toxic, renewable, high-quality diesel motor fuel you can use in your car without modifications.

The use of biodiesel can extend the life of diesel engines because it is more lubricating than petroleum diesel fuel, while fuel consumption, auto ignition, power output, and engine torque are relatively unaffected by biodiesel.

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Ethanol
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Fuel cell
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Solar energy
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