Not long ago, the countries of the world hammered out targets and schedules for renewable energy and biofuels. The EU was to replace 5.75 % of its fuel with alternative energy sources by 2010; the US planned a 25 % renewable energy target by 2025. The vast "green gold" market led to rapid growth in the biofuels industry, and the supply of energy crops outstripped demand.
原來，近年來世界各國紛紛訂出再生能源、生質燃料替代目標和時程──「2010 年歐盟將有 5.75 % 的燃料使用替代能源」、「美國預計在 2025 年，達成 25 % 的再生能源目標」──龐大的綠金市場，造成生質能源工業迅速地發展，各類料源隨之供不應求。