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B100 100% neat biodiesel, a renewable, biodegradable fuel. See also: Biodiesel

B20 Blend of biodiesel fuel with 80% petroleumbased diesel and 20% biodiesel. It can be used in diesel vehicles with no modifications to their engines, fuel systems, or refueling infrastructure. See also: Biodiesel

Background extinction Extinction of species as a result of changes in environmental conditions in an ecosystem.