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  • Biofuels
    • waste sources that can be used as sources of energy
      • crops like straw
      • forestry wastes
      • industrials waste
      • domestic waste
      • anaerobic bacterial digestsion
    • energy crops deliberately grown for energy value
      • wood
      • sugar cane
      • vegetable oils
      • elephant grass
    • advantages of biofuel
      • supply rate of energy crops can be controlled
      • stored until needed
      • replace fuels e.g. petrol
      • carbon neutral
      • high energy denisty
    • disadvantages of biofuel
      • supply of waste is limited by amount produced by source activity
      • large areas required
      • has a high energy density but is still lower than fossil fuels


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