For as long as our species has lived in settled communities, we have struggled to provide ourselves with water. If modern agriculture, the subject of the previous article in this series, is a story of innovation and progress, the water supply has all too often been the opposite: a tale of stagnation and apathy. Even today, about two billion people, most of them in poor, rural areas, do not have a reliable supply of clean water — potable water, in the jargon of water engineers. Bad water leads to the death every year of about a million people. In terms of its immediate impact on human lives, water is the world’s biggest environmental problem and its worst public health problem — as it has been for centuries.
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