沥青砂及生物燃料仅占全球能源消耗的一小部分。
Tar sands and biofuels represent only a small part of global energy use.
其他如沥青砂及乙醇等生物燃料的能源回报倍数仅有个位数。
The return on sources such as tar sands and biofuels like ethanol are in the single digits.
其他如沥青砂及乙醇等生物燃料的能源回报倍数仅有个位数。
The return on sources such as tar sands and biofuels like ethanol are in the single digits.
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