Measuring the Damage of our 'Water Footprint'

Arjen Hoekstra didn't really stand out in the crowd of 2,000 scientists, activists, politicians and representatives of industry roaming the halls of the Stockholm trade fair. Far more attention-getting figures than the 42-year-old Dutch hydro engineer attended World Water Week in Sweden last week. Asian delegates wore glowing saris. And Indian businessman Bindeshwar Pathak drew flocks of media everywhere he went at the event after being named the recipient of this year's Stockholm Water Prize for inventing a toilet for slum dwellers.

But Hoekstra preferred to keep a low profile at the annual global conference, which focuses on water-related issues. He had nothing to prove. Still despite his apparent efforts to keep a low-profile, Hoekstra's creation served as a magnet for debate here. Hoekstra came up with the idea of the "water footprint."

10,000 Liters of Water for a Pair of Jeans

His equation is actually just a couple of numbers used to describe the amount of water that is used -- or polluted -- during the manufacture of various products. Anyone can calculate their water footprint by looking at the amount of water they use directly and then by looking at the amount of "virtual water" they use -- that is, how much water is used in the production of any goods they consume. The global average for an individual's water footprint is 1,243 cubic meters of water per year. In the US, this goes up to 2,483 cubic meters per year; in Germany it's 1,545 and in China, 702.

Hoekstra's water footprint formula has already made headlines around the world with its estimates of the amount of water that is used or abused in the simple products that are a part of our everyday lives:

* 140 liters of water for one cup of coffee!

* 2,400 liters for a hamburger!

* 10,000 liters for one pair of jeans!

In the dicussions and workshops in Stockholm, participants debated what sort of action should be taken as a result of the water footprint figures. The WWF environmental group first recognized the validity of the water footprint, and further conservation and environmental protection groups as well as the United Nations and the World Bank soon followed suit. Finally, even multinational companies like Nestle, Unilever and Pepsi got on board.