Sewage spills threatening salmon survival, says MP

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Food waste is instead taken through a process called anaerobic digestion to create biomethane.

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To discover more fascinating science content, head to bbc.co.uk, search for BBC Inside Science and follow the links to The Open University.

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• Every time I teach world history, I make a point of showing things like the above to my students and reading them Philip Larkin’s “An Arundel Tomb”: