MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Wood chips. A farmer checks a pile of fuelwood chips in a barn. These wood chips were made from coppiced poplar trees, and provide the farm with a renewable source of energy. The chips are burnt in special furnaces that heat air or water for indoor heating. Unlike fossil fuels, fuelwood does not contribute to global warming because regrowth of the coppiced trees absorbs as much carbon dioxide as burning the wood releases. Coppicing involves periodically harvesting wood by cutting young trees to near ground level, which results in regeneration of numerous, thin, woody stems. The technique is based on an ancient form of woodland management. Photographed in Avon, UK.
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