Sewage could be vital to feeding the world

These predictions come in a report by the International Water Management Institute (IWMI) based in Sri Lanka, which is backed by the World Bank. The most detailed of its type, it is based on a survey of 53 cities in Africa, Asia, the Middle East and Latin America. Charles Chartres, director of the IWMI, warned this week that the proportion of food grown using waste water is bound to …

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