"Sometimes the easiest way to trade water is inside a tomato." What does that mean and why is it important?
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Noting, of course, that it's NOT efficient to export food when the water used in its production comes from unsustainable sources. It's not absolute water supply that matters, but relative water scarcity. Tony Allen (who coined the term virtual water) says a lot here: http://www.aguanomics.com/2012/06/water-chat-tony-allen.html