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Fuel in the form of biodiesel can be made from old cooking oil, animal fat and plants such as sunflowers. At a biodiesel refining plant in Motherwell, 35,000 tonnes of old cooking oil and animal fat is filtered each year and chemically converted into diesel fuel. The fuel is mostly mixed with normal diesel to power lorries and some cars. Biodiesel is produced from plant material and so in theory it is carbon neutral – the plants it is produced from consume the same amount of carbon dioxide as is produced when the biodiesel is burned.