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Scientists are warning Asian countries that they face chronic food shortages and social unrest if they don't improve water management to cope with expanding populations. Water experts say countries in both south and east Asia must spend billions of dollars to improve antiquated irrigation systems. A report warns that without big changes to irrigation many nations will have to import food. The report says that 94 percent of suitable land in South Asia is already being used for growing food. According to their computer model the continent could obtain three quarters of the additional food it needs with better irrigation systems. The report will be presented to the World Water Week conference in Stockholm today. The study was carried out by the International Water Management Institute and the United Nations Food and Agriculture Organization.
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