But we should not rush to abandon bio-fuels, despite some undoubtedly poor policies in recent years. Some bio-fuels are far more cost-effective and energy-efficient than others, and different bio-fuel stocks have very different opportunity costs for food agriculture (sugar has not experienced any significant price increase).
但是我们不应该匆忙地放弃生物燃料，尽管最近几年所实施的某些政策无疑非常糟糕。某些生物燃料比其他生物燃料更具成本效益并且更节能，而不同的生物燃料储备对于食品农业有着非常不同的机会成本（比如，糖的价格就基本上没有出现很大的上涨）。