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Water footprints

An interesting article has been published on the Proceedings of the National Academy of Sciences. The study quantifies and maps the water footprint of humanity. Agricultural production accounts for 92% of world’s water footprint. Cereal products, in particular, give the largest contribution to the water consumption of the average consumer (27%), followed by meat (22%) and milk products (7%). The study shows that several countries rely significantly on foreign water resources and that many countries influence water consumption and pollution elsewhere. About one-fifth of the global water footprint is associated to products that are exported. Quite interestingly we tend to virtually import a huge amount of water consumption we are not aware of. An example? A coffee with milk cup needs 200 liters of water to be manufactured, from field to cup.

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