One problem is that even though the raw materials used in industrial biotechnology may not be derived from fossil fuels, they are still capable of stirring up some difficult ethical questions.
其中的一个问题是，尽管工业生物技术中使用的原材料不来自矿物燃料，但仍会引起难以解决的道德问题。
Because biodiesels can be made from materials derived from plants, which use carbon dioxide to grow, they potentially have a much lower carbon footprint than petroleum-based fuels.
由于生物柴油的原料都是来自与植物，而植物本身就会转化为二氧化碳，所以这样的话使用生物燃料的碳排放相对来讲比使用化石燃料的碳排放要小。
To have a pure hydrogen economy, the hydrogen must be derived from renewable sources rather than fossil fuels so that we stop releasing carbon into the atmosphere.
为了获得清洁的氢燃料经济，必须采用可再生的原料来分离出氢气，而不是石化燃料，这样我们就能够阻值二氧化碳进入大气。
It is thus believed that the biomass-derived polyols will become new bio-platform molecules for renewable fuels and chemicals.
指出生物质多元醇将成为今后合成可再生燃料和化学品等的新型平台分子。
It is mainly derived from algae that farmed on large scales for creating the bio-fuels.
它主要来源于为大量生产生物燃料而大面积养殖的藻类。
At the beginning, the first generation bio-fuels are derived from starch, vegetable fats, and sugar that all are in turn derived from crops.
最开始，第一代生物燃料来源于由农作物转变而成的淀粉，植物油和糖。
Another type of first generation fuels are also derived from animal fats.
另一种类型的第一代燃料源自动物油。
Next, the second generations of bio-fuels are basically derived from waste biomass, which is a brilliant idea to turn water to wine.
接下来，第二代生物燃料基本上来自废物，这是一个把水变成酒的绝佳想法。
Next, the second generations of bio-fuels are basically derived from waste biomass, which is a brilliant idea to turn water to wine.
接下来，第二代生物燃料基本上来自废物，这是一个把水变成酒的绝佳想法。
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