One way to wean ourselves from oil is to come up with renewable sources of transportation fuel. That means a new generation of biofuels made from nonfood crops.

• 一个令我们逐步摆脱对石油依赖的途径就是研制出可再生的运输燃料。这意味着从非食品作物中研制出新一代的生物燃料。