2.6 billion people around the world still have no access to proper sanitation. Yet according to the latest figures, open defecation - considered to be the riskiest sanitation practice of all - has decreased to 17 per cent of the world's population. That's also thanks to Singaporean businessman Jack Sim: He wants to put an end to public defecation and unsanitary bathrooms. Sim left his business to found an influential advocacy group, the World Toilet Organisation. Sim argues business can create dramatic social change by providing affordable toilets and at the same time make hefty profits.

Report: Michael Atkin