One cup of coffee is equivalent to 130 litres of water

The Water Footprint Network is based at the University of Twente in the Netherlands whose mission is to promote the transition towards sustainable, fair and efficient use of fresh water resources worldwide (Link). This remarkable organization is doing this via a number of interesting initiatives including the development of a water footprint model. Water diaries are widely used to construct how water is used within the home from a supply source. However, they do not take into account how much water we consume indirectly through the manufacture and preparation of food, clothes and other goods. It takes 6,800 litres of water to make a single pair of denim jeans for example. The calculation of virtual water usage has proven to be very difficult to calculate until recently.  However, the WFN have produced an on-line calculator for this very purpose. This calculator is based on an impressive research base with a large number of their reports and refereed papers available as downloads. From our exploration of the model, it is very accurate. The calculator can be accessed via this link.