Public Release:  Virtual water cannot remedy freshwater shortage

Institute of Physics

The implementation of virtual water into trading deals has been suggested as a realistic solution to solving the global inequality of renewable freshwater, but new research suggests that it may not be as revolutionary as first thought.

In a study published today, Tuesday 7 June, in IOP Publishing's journal Environmental Research Letters, researchers have claimed that virtual water is unlikely to increase water use equality, primarily because the existing amount of virtual water is not large enough to overcome the inequalities that exist.

Lead author David Seekell, of the University of Virginia, said, "Virtual water is unlikely to overcome these constraints because there just isn't enough to go around."

80 per cent of humanity currently lives in regions where water security is threatened, meaning that as the global population grows against a finite volume of freshwater, a more equal distribution of water use between countries will be needed.

Virtual water--the amount of water it takes to produce goods or a service--has been suggested as a possible solution to this growing problem by using virtual water values to inform international trade deals.

Most goods carry a virtual water value--for example, producing one kilogram of beef requires 15 thousand litres of water--which can act as a significant tool for addressing a country's input and output of water.

For example, a trade deal could be struck where products with a high virtual water value, such as oranges, could be exported from countries where there is an efficient and abundant water supply, into a country where the requirement of water to grow that particular product is more of a burden.

This would allow the receiving country to save on water, relieving the pressure on their limited water resources, and allowing the water to be used elsewhere in its infrastructure.

This study, performed by researchers at the University of Virginia, assessed the inequality in water use between countries and examined how different uses, such as industrial, household, and for agricultural products consumed domestically, contributed to the overall inequality.

To do this, the authors compared United Nations statistics on both social and human development statuses with water usage statistics for a range of countries.

Their study concludes that virtual water transfers are not sufficient to equalise water use among nations because water used for agriculture consumed domestically dominates a nation's water needs and cannot be completely compensated by current volumes of virtual water transfers.

Seekell continued, "Even if it cannot completely equalise water use between countries, virtual water may stand to contribute to this effort if there is increased transfer from high water use to low water use countries, but the danger here is that these transfers effectively prop up populations above the carrying capacity of their natural resources and this could actually erode a population's long-term resilience to drought or other disasters.

"There are a myriad of political and economic barriers to trade, and because water is not usually a deciding factor in trade decisions, it is unlikely that global trade will ever be viewed as efficient from a water use point of view."

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From Tuesday 7 June, this paper can be downloaded from http://iopscience.iop.org/1748-9326/6/2/024017

Notes to Editors

Contact

1. For further information, a full draft of the journal paper or contact with one of the researchers, contact IOP Press Assistant, Michael Bishop: Tel: 0117 930 1032 E-mail: Michael.bishop@iop.org

Virtual water transfers unlikely to redress inequality in global water use

2. The published version of the paper "Virtual water transfers unlikely to redress inequality in global water use" (Environ. Res. Lett 6 024017) will be freely available online from Tuesday 7 May 2011. It will be available at http://iopscience.iop.org/1748-9326/6/2/024017

Environmental Research Letters

3. Environmental Research Letters is an open access journal that covers all of environmental science, providing a coherent and integrated approach including research articles, perspectives and editorials.

IOP Publishing

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The Institute of Physics

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It has a worldwide membership of around 40 000 comprising physicists from all sectors, as well as those with an interest in physics. It works to advance physics research, application and education; and engages with policymakers and the public to develop awareness and understanding of physics. Its publishing company, IOP Publishing, is a world leader in professional scientific publishing and the electronic dissemination of physics. Go to www.iop.org

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