In Europe, the rapid conversion of fields that once grew wheat or barley to biofuel crops like rapeseed is already leading to shortages of the ingredients for making pasta and brewing beer, suppliers say. That could translate into higher prices in supermarkets.

“New and increasing demand for bioenergy production has put high pressure on the whole world grain market,” said Claudia Conti, a spokesman for Barilla, one of the largest Italian pasta makers. “Not only German beer producers, but Mexican tortilla makers have see the cost of their main raw material growing quickly to historical highs.”

Some experts are more worried about the potential impact to low-income consumers. In the developing world, the shift to more lucrative biofuel crops destined for richer countries could create serious hunger and damage the environment if wild land is converted to biofuel cultivation, the agriculture panel concluded.

But officials at the European Commission say they are pursuing a measured course that will prevent some of the price and supply problems seen in American markets.

In a recent speech, Mariann Fischer Boel, the European agriculture and rural development commissioner, said that the 10 percent target was “not a shot in the dark,” but was carefully chosen to encourage a level of growth for the biofuel industry that would not produce undue hardship for Europe’s poor.

She calculated that this approach would push up would raw material prices for cereal by 3 percent to 6 percent by 2020, while prices for oilseed might rise 5 percent to 18 percent. But food prices on the shelves would barely change, she said.

Yet even as the European program begins to harvest biofuels in greater volume, homegrown production is still far short of what is needed to reach the 10 percent goal: Europe’s farmers produced an estimated 2.9 billion liters, or 768 million gallons, of biofuel in 2004, far shy of the 3.4 billion gallons generated in the United States in the period. In 2005, biofuel accounted for around 1 percent of Europe’s fuel, according to European statistics, with almost all of that in Germany and Sweden. The biofuel share in Italy was 0.51 percent, and in Britain, 0.18 percent.