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Want to know which cities suffer from water stress? The Nature Conservancy has published a list of the top 20 of cities with water stress. Over 500 cities around the world were investigated. In (big) cities like Tokio, Shanghai and LA, a large number of people in a relatively small area puts a lot of pressure on water supplies, especially during times of drought.
We often hear about how efficient our cities are, with low per capita carbon footprints and energy consumption. But hidden in here is the simple fact that with these masses of humanity, we need to supply huge amounts of materials and energy flows to sustain the often many millions of individuals and all their associated activities.