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Biodiesel refinery in Austria, near fields that can grow oilseed

Older diesel Mercedes are popular for running on biodiesel

In some countries biodiesel is less expensive than conventional diesel

Biodiesel is a type of fuel prepared by changing vegetable oil, animal fat, special types of algae and possibly even sewage. It is considered a type of renewable energy, since it all comes from living plants and animals. It can be used to power an engine, usually for vehicles, including airplanes. It replaces diesel that comes from petroleum, a type of fossil fuel.