Virtual water

"Stockholm, March 19, 2008 – Professor John Anthony Allan from King’s College London and the School of Oriental and African Studies has been named the 2008 Stockholm Water Prize Laureate. Professor Allan pioneered the development of key concepts in the understanding and communication of water issues and how they are linked to agriculture, climate change, economics and politics.

People do not only consume water when they drink it or take a shower. In 1993, Professor Allan, 71, strikingly demonstrated this by introducing the “virtual water” concept, which measures how water is embedded in the production and trade of food and consumer products. Behind that morning cup of coffee are 140 litres of water used to grow, produce, package and ship the beans. That is roughly the same amount of water used by an average person daily in England for drinking and household needs. The ubiquitous hamburger needs an estimated 2,400 litres of water. Per capita, Americans consume around 6,800 litres of virtual water every day, over triple that of a Chinese person." From SIWI website. (Thanks Dave)