WATER QUALITY IN MIDDLE AWASH - A water-secure world

As the map "Largest urban agglomerations" shows, just eight cities had populations of 5 million or more in 1950, two of them in less developed countries. Megacities numbered 41 in 2000. By 2015, 59 megacities will exist, 48 in less developed countries. By the turn of the century, cities of 10 million and larger will be more common. ................
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