In a country where temperatures can soar above 105 degrees Fahrenheit, water is too precious an agricultural resource to leave to threat from small-clawed crustacean.

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Even in arid market economies where every drop is precious, the price of water seldom reflects scarcity.

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While the facility would only operate at full capacity for 12 hours a day, the technology is designed to work without water, which is often used in cooling systems for solar thermal plants and is a precious commodity in Arizona.

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Ultimately, however, Namibia's most precious resource is likely to be water.

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Dealing with pollution in cities, the depletion and deterioration of water supplies, or the destruction of forests and precious biodiversity is urgent and can make a big difference.

ECONOMIST: Economics focus: Why quality matters | The