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The production of carbon neutral fuel - biodiesel - from cooking oil, animal fat and plants. 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 so is, in theory, carbon neutral. The reason for this is that the plants that biodiesel is produced from consume the same amount of carbon dioxide as is produced when the biodiesel is burned