What is a biofuel?
Biofuels are fuels made from plant materials (or animal waste).
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How is biofuel different to a fossil fuel like petrol?
Biofuels are made from living or recently living organisms, such as plants and algae (or from animal waste).
In contrast, fossil fuels are made from organisms which died millions of years ago.
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Give 3 advantages of biofuels.
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Give 2 disadvantages of biofuels.
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Why are biofuels carbon neutral (in theory)?
They absorb the same amount of carbon dioxide while growing as they release when they're burned - so there is no net release of carbon dioxide.
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Why are biofuels not really carbon neutral in practice?
In order to grow the biofuels, we often have to clear land by cutting down trees. This means the trees can no longer photosynthesise and absorb CO2 themselves, and will also release large amounts of CO2 if burned. In addition, it usually requires a lot of energy to harvest, process, and transport the biofuels, which itself will produce a lot of CO2.
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