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In terms of water stress levels, it is generally considered that countries with annual supplies of 1,000-2,000 m3 per person are water-stressed, with 1,000 m3 thought to be the minimum per capita requirement of a moderately developed country.<ref name="Mohsen" /> Societies with less than 500 m3 per capita are said to suffer from absolute scarcity, so this "lack of water then requires application of expensive technologies and becomes a constraint on food production, social and economic development, and protection of natural systems.”<ref name="Mohsen" /> | In terms of water stress levels, it is generally considered that countries with annual supplies of 1,000-2,000 m3 per person are water-stressed, with 1,000 m3 thought to be the minimum per capita requirement of a moderately developed country.<ref name="Mohsen" /> Societies with less than 500 m3 per capita are said to suffer from absolute scarcity, so this "lack of water then requires application of expensive technologies and becomes a constraint on food production, social and economic development, and protection of natural systems.”<ref name="Mohsen" /> | ||
It is generally accepted that we face a global water crisis, elements of which can be summed as follow:<ref>Medina Jr, Miguel A. "Global water crisis and climate change." Journal of Hydrologic Engineering 15.3 (2010): 167-170.</ref> | It is generally accepted that we face a global water crisis, elements of which can be summed as follow:<ref name="Medina"> Medina Jr, Miguel A. "Global water crisis and climate change." Journal of Hydrologic Engineering 15.3 (2010): 167-170.</ref> | ||
*More than 2.4 billion people have no access to sanitation and more than 1.2 billion lack potable water. | *More than 2.4 billion people have no access to sanitation and more than 1.2 billion lack potable water. |
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