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The old rhyme of "The Old Mariner" has become an excellent description of the state of fresh water scarcity in the world. The UN and other international organizations have predicted that water will become one of the most sought after assets during the twenty first century. Actually geopolitical conflicts about water are not uncommon and with the approaching climate change and increased demand for water the conditions can only intensify.
Calculating carbon and ecological footprints has been common , at least in some circles, for a while. But now an organization has been attempting to highlight what it calls the water footprint per capita per year. As you look at the figures in the accompanying table you must resist the temptation of treating water as a non renewable resource. Water is not oil although the increase in demand makes it more scare.
A selective list of cubic meters of water used annually per capita:
Nation.................Cu. Meters/cap/annum
USA...........................2500
Italy.........................2300
France........................1900
Australia.....................1400
China..........................700
Furthermore it has been estimated that to produce a liter of milk requires 1000 liters of water , a kilogram of wheat 1350 liters of water and for each cup of coffee 1120 liters of water!!!!
Note: Does this mean that the Prius drivers should not stop at Starbucks any longer? :-)