Water

With Air, the most precious and vital resource on Earth; at the core of the sustainability debate; and a huge and growing world issue. An increasingly scarce resource with a very inequitable distribution, water is coveted to the point of provoking wars. A critical component of human economic activities: agriculture, industry, and transportation. An absolute condition for life. Water is a limiting factor for life on land. Water is the vital media in the ocean. Water is a curious thing, observed the economist Adam Smith: although it is vital to life, it costs almost nothing, whereas diamonds, which are useless for survival, cost a fortune.
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