Only one-third of the water that annually runs to the sea is accessible to humans. Of this, more than half is already being appropriated and used. This proportion might not seem so much, but demand will double in thirty years. And much of what is available is degraded by eroded silt, sewage, industrial pollution, chemicals, excess nutrients, and plagues of algae. Per capita availability of good, potable water is diminishing in all developed and developing countries

Marq de Villiers
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