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When you get your hair cut, you probably don't think much about what happens to the bits that get chopped off.

But it turns out that rather than being dumped in the rubbish, hair can be put to all kinds of uses that can help clean up the planet and feed the people who live on it.

We meet a hairdresser who weaves the clippings into mats that get used to soak up oil spills.

Plus the young entrepreneur in Tanzania who's worked out how to turn human hair into a powerful crop fertiliser.

Produced by Daniel Gordon