Alarmed by rising global food prices, some European leaders are rethinking their commitment to use ethanol fuel and are considering other policy changes to lower the costs of basic staples. British Prime Minister Gordon Brown became the latest official to say that the European Union may have to back off its goal of having ethanol account for 20% of the motor vehicle fuel burned on Europe's roads by 2020. The use of corn and sugar to make ethanol is a main driver of rampant inflation in worldwide food costs during the past year. Grocery bills are up across Europe, and the United Nations World Food Program says that rising food prices have pushed 100 million people into hunger worldwide. Rising food demand from developing economies such as China and India, plus stagnant crop yields in food-producing nations, also are behind the recent jump in costs. "A world food crisis