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When he was a schoolboy in Awendo in Kenya, Tom Osborn watched his mum get ill from breathing in the smoke from her cooking stove. In fact, the World Health Organisation says 4 million people around the world die prematurely every year from the smoke produced by stoves that burn wood or charcoal. Tom was determined to produce a cleaner form of charcoal and set up a company called Green Char, that uses sugar cane waste to manufacture a fuel that gives off 90% less smoke. He's just 19 years old - but this year Forbes magazine put him on their list of "30 under 30" social entrepreneurs.