Biofuels and a dwindling water supply
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AT LAST, many of the world's political leaders have begun to realize that diverting land and food crops to produce biofuels leads to higher food prices. But an equally important consequence of this policy folly is being largely ignored in the public and political debate: Producing biofuels will further deplete the world's already overtaxed water supply.
This is emblematic of a larger and increasingly dangerous disregard for the world's most valuable, irreplaceable and finite natural resource: fresh water.
Seventy percent of all water withdrawal is already used in agriculture, and while all such activity requires water, growing enough soy or corn to create biofuels is especially water-intensive. For example, to produce just 1 gallon of diesel fuel, up to 9,000 gallons of water are required. Up to 4,000 gallons are needed to produce enough corn for the same amount of ethanol. By way of contrast, producing enough food to meet the caloric needs of one person for one day in, for example, Tunisia or Egypt requires about 666 gallons of water, and twice as much in California.
If all the biofuel targets and timelines set by governments across the world are met, we can expect water withdrawals for agriculture to increase by up to one-third. Making a dent in the world's energy problems with biofuels will require much more water than the world can afford to give up. There simply isn't enough; water tables are falling throughout the world. While there are substitutes for oil, there are none for water.
The world is facing a water crisis and, consequently, a food crisis that in terms of severity and potential impact far supersedes the current food crisis or the exhaustion of fossil fuels. Either it never occurred to biofuel advocates to ask about the amount of water needed for biofuel production, or they simply chose to ignore this particular inconvenient truth.
According to a report by the International Water Management Institute, by 2025 about one-third of the world's population, perhaps as many as 3 billion people, will face water shortages. From an agricultural standpoint, we may be looking at losses equivalent to the entire grain crops of India and the United States by then. According to some estimates, even without biofuels we are likely to reach the upper limit of available fresh water for worldwide consumption, more than 2.9 billion cubic miles, by 2050. A growing reliance on biofuels would exacerbate an already difficult challenge.
Regardless of how it happened, policy makers neglected the dwindling supply of a resource essential to life in order to replace fossil fuels and fight global warming. This was not a sensible trade-off. There is no question that we have to reduce consumption of fossil fuels. But biofuels derived from food crops planted exclusively for that use are the wrong solution.
This scandal is instructive because it was caused, in part, by the general attitude toward water in both the developed and developing world. Water is still treated as a limitless resource in too many communities, and one reason is that it is has no price. States heavily subsidize water usage so that it is sometimes even free for both farmers and consumers. Because it is not assigned a value in the marketplace, there is no incentive for using it efficiently.
The water problem can be solved. It requires much more careful stewardship of water supplies by local and national governments. Reasonable pricing policies would help by encouraging the use and development of water-efficient crops and smart-irrigation systems. But even those who disagree with that prescription should be disturbed by the lack of attention paid to water by those who rushed headlong to biofuels as the answer to the world's energy problems.
As the international community grapples with how to fight global warming and build a sustainable future, it must stop ignoring a priority that is even more pressing.
Failure to address the water problem will result in food scarcity. It is no longer an environmental issue. It is a national and international security issue that can not be ignored.
Peter Brabeck-Letmathe is chairman and former chief executive of 
