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Water, Water, Everywhere, But Not Enough To Waste

Here's a fact worth pondering: Farming accounts for 70 percent of all the water that's used for any purpose, worldwide. And demand for it is growing, along with the planet's population and our increasing appetite for meat. That's according to the UN's (FAO), which recently published this poster and others in a striking series on the vital role of water in growing our food.

But what if that water runs out, leaving fields wilted and stomachs empty? In some places — think of California, or China's Yellow River basin — there's genuine scarcity of water for agriculture. Yet according to a collection of studiesjust published in the journal Water International, that's an exception to the rule.

Researchers examined ten of the world's most important river basins, including the Nile, the Mekong, the Volta and the Indus-Ganges, and concluded that in most of them, there's plenty of water for everyone.

The catch? It has to be used efficiently and shared fairly.

In sub-Saharan Africa, where agricultural productivity is lowest and food shortages are most common, "huge volumes of rainwater are lost or never used," says Alain Vidal, director of the , which commissioned the studies.

Small reservoirs could help. They catch rainfall and store it until it's needed. Just as important: All farmers need access to that stored water, not just the wealthy and well-connected.

The "Challenge Program" that sponsored these studies is the brainchild of a far-flung network of institutions called the Consultative Group on International Agricultural Research. It's dedicated to improving crops and farming practices in the world's poorest countries.

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Dan Charles is an independent writer and radio producer who contributes regularly to NPR's technology coverage. He is currently filling in temporarily as an editor on the National Desk, responsible for coverage of the environment and the western United States. He is author of Master Mind: The Rise and Fall of Fritz Haber, the Nobel Laureate Who Launched the Age of Chemical Warfare (Ecco, 2005). He also wrote Lords of the Harvest: Biotech, Big Money, and the Future of Food (Perseus, 2001), about the making of genetically engineered crops. From 1993 to 1999, Charles was a technology correspondent for NPR. Charles covers a wide swath of advanced technology, including telecommunications, energy, agriculture, computers, and biotechnology. He's reported for NPR from India, Russia, Mexico, and various parts of Western Europe. Before joining NPR, Charles was a U.S. correspondent for New Scientist, a major British science magazine.
Dan Charles is NPR's food and agriculture correspondent.