The Twin Dilemma for Cities
 ore and more people are choosing to live in cities. With more than half of humanity urbanized, there is an urgent need to take an integrated and holistic view of the supply and demand for water in Cities. While many cities, particularly in developing countries, are facing acute scarcity in providing clean safe water, urban managers are daunted by the complex task of sanitation - managing the wastewater generated by cities, so that harmless, clean water is returned to the natural water cycle.
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