Giulio Boccaletti in Aeon:
A great river encircles the world. It rises in the heartland of the United States and carries more water than the Mississippi and Yangtze rivers combined. One branch, its oldest, streams over the Atlantic, heading for Europe and the Middle East. Another crosses the Pacific, flowing towards China. Countless tributaries join along the way, draining the plains and forests of Latin America, Europe and Asia.
You probably have never heard of such a river, even though almost all of us draw from it. You cannot fish in it, float on it, drink from it. If you were to look, you would not find it: it is invisible. Yet there is no doubt that it flows.
The river starts anywhere water feeds agriculture. But from there, physical water vanishes, replaced by a flow of crops that carry only the memory of the water used to produce them. Crops then travel along the shipping lanes of the global trade system, eventually displacing the water that would have otherwise been used to grow them locally. Thus, water flows from source to destination ‘embedded’ in its products. It is a flow of ‘virtual water’, an idea first developed in the 1980s by the late geographer Tony Allan.
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If you’ve read any of Ball’s remarkable books, you might have noticed something I found extraordinary, which led to the question that began our conversation. Ball has written books on subjects as diverse as the history of China (The Water Kingdom), physics, chemistry, biology, music (The Music Instinct) and Chartres Cathedral (Universe of Stone). In all of his books, he brings the highest quality scientific and scholarly research, often from vastly different fields, into a coherent, intellectually original, and exciting story. Besides writing popular books, he actively publishes peer-reviewed research, and his written scientific articles in fields as diverse as astrobiology, physics, chemistry, and biology. It is a remarkable and uncommon combination of breadth and depth, even among the many brilliant writers in the world of science.
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