China's and India's plans to produce more biofuels could cause shortages of water, which is needed for crops to feed their growing populations, according to study results released on Thursday.
The International Water Manage-ment Institute (IWMI) study said both countries are counting on maize and sugarcane, which need large amounts of water, for much of their biofuels.
"Crop production for biofuels in China and India would likely jeopardize sustainable water use and thus affect irrigated production of food crops, including cereals and vegetables, which would then need to be imported in larger quantities," Charlotte de Fraiture, the study's lead author, said in a statement.
"Are these countries, particularly India which has devoted so much effort to achieving food security, adequately considering the trade-offs involved, especially the prospect of importing food to free up sufficient water and land for production of biofuel crops?" she asked.
The study follows one released earlier last week by the National Research Council, which warned that increased production of these crops for ethanol could threaten water supplies in the US.
The IWMI study was the latest to warn that growing demand for biofuels could shortchange poorer countries that depend on staples like maize to feed their populations.
Setting aside more land for biofuels could also raise prices for everything from eggs to beef, as feed for animals would become more expensive.
"For the 2 billion poorest people in the world, many of whom spend half or more of their income on food, rising grain prices can quickly become life-threatening," Lester Brown, the founder of the Washington-based Earth Policy Institute think tank, wrote last year.
"The broader risk is that rising food prices could spread hunger and generate political instability in low-income countries that import grain," Brown wrote.
The IWMI study said China aims to increase biofuels production fourfold to around 15 billion liters of ethanol -- 9 percent of its projected gasoline demand -- by 2020, from a 2002 level of 3.6 billion liters.
India is pursuing a similarly aggressive strategy. Earlier this week, the Indian Cabinet approved a plan to require oil companies to sell gasoline with a blend of at least 10 percent ethanol by next year or double current levels.
To meet their biofuels targets, China would need to produce 26 percent more maize and India 16 percent more sugarcane, the study found. It said doing so would require an extra 75 liters of irrigation water per person per day in China, and an additional 70 liters per day in India, beyond what is needed for food.
IWMI's David Molden said in a statement that the situation could worsen already dire water shortages in parts of China and India.
"Without major changes in water management, how are we going to feed a growing population, satisfy increasing demand for meat, and, on top of that, use crops as a major source of fuel?" he asked.
The study suggested that the two countries could focus on crops that need less water, such as sweet sorghum for ethanol, and species including the jatropha bush and pongamia trees for biodiesel.
India has already announced plans to plant about 3.1 million hectares of jatropha plantations by 2009, and to have identified another 40 million hectares of wasteland by then to grow the plant. Jatropha seeds are crushed and mixed with fuel to produce biodiesel.
IWMI is a Sri Lanka-based nonprofit institute that focuses on sustainable use of water and land resources. It has 100 scientists from 16 countries and works on research projects in 21 countries.
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