WaterVirtual water would not remedy global fresh water shortage
More than 80 percent 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 — that is, 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; a new study suggests that it may not be as revolutionary as first thought
Example of virtual water - product exchange // Source: welikeitraw.com
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 7 June 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.”
An institute of Physics release reports that 80 percent 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 fifteen thousand liters 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 in which 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 UN statistics on both social and human development statuses with water usage statistics for a range of countries.
The release notes that their study concludes that virtual water transfers are not sufficient to equalize 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 equalize 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.”
— Read more in D. A. Seekell, P. D’Odorico, and M. L. PaceVirtual, “water transfers unlikely to redress inequality in global water use,” Environmental Research Letters 6, no. 2 (7 June 2011) (doi: 10.1088/1748-9326/6/2/024017)
