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Biomass was the first fuel that humans discovered - when they used wood to make fires.
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Biomass is basically anything that once was alive, including trees, plants, animal poo and food waste.
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The largest biomass power station in the world is in Cambridgeshire, where straw is burned to make electricity for 80,000 homes - a tiny amount compared to the electricity made by a normal gas power station.
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Despite this, biomass remains the most important source of energy in the world apart from fossil fuels.
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Credits: Mark Edwards/Still Pictures
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