For example, since 2006, a portion of land that was also formerly used to grow other crops in the United States is now used to grow corn for biofuels, and a larger share of corn is destined to ethanol production, reaching 25% in 2007.
例如，美国自2006年以来，部分曾用于种植其他作物的土地现在用于生产生物燃料，同时有大量的玉米被用于乙醇生产，这一比例在2007年达到25%。