In industry, iodine is the main content of composing organic fuel, which can make phthalein series tar fuel.

在工业中，碘是合成有机燃料的主要成分，可以制酞系的焦油燃料。

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Our known fossil fuel reserves are soaring. New finds of coal, natural gas, oil, tar sands, and oil shale keep growing, not declining.

已知的矿石燃料储备猛涨；不断有新的煤矿、天然气、石油、焦油砂和油页岩被发现；人口数量也在增长。

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Some American retailers have forsworn fuel from the tar sands.

一些美国零售商发誓不购入产自油砂的燃料。

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In light of such support, TransCanada, the owner, has let it be known that it will develop its tar sands and if such fuel does not head to the United States, the raw products will instead get shipped to and refined in Asia a proposition that has some scared that even more greenhouse gas emissions would be created.

FORBES: After the Election, Keystone Pipeline Will Get Freed From Political Trap

Oil shale and tar sands are other sources of liquid fuel that are harder on the environment than petroleum.

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They will soon bioengineer bacteria to melt oil out of tar sands, turn grass into diesel fuel and scavenge natural resources of every kind out of low-grade, thinly dispersed deposits.

FORBES: Techno-Optimism