Some of that is being forced by the United States and the corn to ethanol conversion program that has pushed up the price of corn a great deal, pushed down the world supply of corn for eating, and pushed up world prices.

美国在一定程度上推动了这件事,玉米向乙醇转化项目,大大抬高了玉米价格,削减了可供食用玉米的供应量,世界玉米的价格就提高了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选