When people began to realise that there was not enough oil on the earth, they asked car makers to produce more efficient and less polluting cars.

当人们开始意识到地球上没有足够的石油时，他们要求汽车制造商生产能效更高、污染更少的汽车。

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However, a two-stroke engine USES more gasoline and burns lots of oil, so it is far more polluting.

二冲程发动机使用更多的汽油，燃烧更多的燃料，所以产生更多的污染。

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In a very general sense, Americans know that oil is polluting though the majority fails to grasp the diverse environmental risks associated with its production.

一般来说，美国人都知道石油带来污染，尽管多数人不能深刻了解与石油生产有关的各种环境风险。

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The bill made polluting oil companies responsible for all containment and clean-up costs.

WSJ: Obama's Political Oil Fund

Why is coal more polluting than oil?

FORBES: What Would Happen To The Current Fracking Activity And Subsequent Booms Generated If Oil $/bbl Were To Drop?

Wind farms are being planned as part of the UK and Welsh governments' push to produce more electricity from less polluting sources, and reduce the use of coal, oil and gas.

BBC: Mid Wales