Unit 3: Biofuels

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  • Biofuels
    • Advantages
      • Reliable - know crop seasons
      • Higher energy density
      • Chemical biofuels can be stored
      • Supply rate can be controlled
      • Can replace vehicle fuels
      • Carbon neutral fuels
    • Disadvantages
      • Habitat loss for crop fields
      • Limited waste biofuel supply
      • Competition for land with food production
      • Intensive farming may release lots of carbon dioxide
    • Examples
      • Crop wastes e.g. straw
      • Forestry wastes
      • Combustible domestic and industrial waste
      • Methane from anaerobic digestion or landfill
      • Wood
      • Elephant grass
      • Sugar cane/sugar beet
      • Palm and sunflower oils

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