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Everything we burn or have ever burned for fuel originated as a living thing. It either started out as a plant, gathering energy from the sun and pulling carbon dioxide out of the air to store that energy, or else it was an animal that ate that plant (or ate the animal that ate that plant). In one sense, all fuel is biofuel, however, we generally reserve the “biofuel” designation for material that was recently living – to distinguish it from fossil fuel.
