Example image of eyePlorer eyePlorer map for 'Biofuel': 2000s energy crisis Energy security Liquid fuels Alcohol Biofuel Fermentation Gasoline Animal fat Biodiesel Vegetable fats and oils Oil Transesterification Energy density Liquid Solid Air pollution Internal combustion engine Specific power Gas Pump Starch Sugar Butanol Enzyme Ethanol Microorganism Propan-1-ol Butanol fuel Ethanol fuel Ethanol fuel in Brazil Alcohol fuel Alcoholic beverage Fruit Maize Molasses Potato Sugar beet Sugarcane Wheat Distillation Drying Bagasse Fossil fuel Natural gas Work (physics) Octane rating Thermal efficiency Oxidizing agent Fireplace Sustainability