As global population increases and people become wealthier, agricultural production will need to likewise increase, but food systems may become more stressed because of competition for water.
Water is also used in everyday products at astounding rates - e.g. a single cup of coffee costs 130 litres of water, while about 18,900 litres are needed to produce 1 kg of roasted coffee.
A 2012 infographic looked at the state of the world's "water economy".
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