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。
How long can we continue to supplement agroecosystems with energy derived from declining fossil fuel supplies?
由于矿物燃料供应量下降，我们供应农业生态系统能量能持续多久？
A crystalline compound, C18H 18, derived from pine tar, fossil resins, and tar oils.
一种结晶化合物，C18 H18，从由松焦油、化石树脂及焦油中提取。
Inertinite includes fusinite (fossil charcoal), sclerotinite derived from fungal remains, and other high-carbon materials with a low-hydrogen content and a high reflectance.
惰质组包括丝质体(化石木炭)、源自真菌残体的菌类体，以及含氢低、高反射率的其他高碳物质。
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。
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。
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