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Alhaji Siraj Bah from Sierra Leone is only 20 years old and yet he has achieved a great deal. He's become an entrepreneur and environmentalist and makes attractive biodegradable paper bags using banana fibre to provide a real alternative to plastic. Alharji has seen at first hand the devastation in his country caused by mudslides- something made much worse by deforestation and plastic rubbish blocking the drains. He was spurred into action after his best friend's entire family died in mudslides in the capital Freetown. Presenter: Jo Fidgen Producer: Deiniol Buxton and Alice Gioia Picture: School children empty banana skins from their food waste box into a composter Credit: Getty Images