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In this episode of 'Horizons', Adam Shaw is in New York City catching up with Dr. Doulaye Kone, senior program officer for sanitation technology with the Bill and Melinda Gates Foundation. We tackle the issue of sanitation 2.5 billion people, including a billion children - do not have access to a clean, safe toilet, according to the Water Supply and Sanitation Collaborative Council. New technologies are needed to deal with our growing human waste issue, a source of both disease and potential nutrients.