Each tonne of fuel burned also produces 3.2 tonnes of carbon dioxide.
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Prev: From ancient oak forests to centuries-old groves1 of ash or beech2, they provide a refuge for wildlife, including butterflies, birds and insects, and lock up millions of tonnes of carbon.
Next: A megajoule is equivalent to the energy released when a one-tonne vehicle slams into a wall at 160kmh.
