The specific impact of the greenhouse effect is unknowable.

温室效应的具体影响尚不可知。

《柯林斯英汉双解大词典》

What gas do you think was the first suspect in causing the greenhouse effect?

你认为导致温室效应的第一个嫌疑是什么气体？

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For major issues such as the melting ice caps and the greenhouse effect, governments and large companies are duty-bound to take necessary measures.

对于诸如冰冠融化和温室效应等重大问题，政府和大公司有责任采取必要的措施。

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It asks major polluting countries to voluntarily reduce gases linked to what scientists call the greenhouse effect.

VOA: special.2010.01.19

Today we discuss the greenhouse effect.

VOA: special.2009.12.22

HFC, for example, an industrial gas, has 11, 000 times the greenhouse effect of CO2.

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First, "greenhouse gases" refers to several gases recognized by scientists as enhancing the greenhouse effect.

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The harmful pollutants released into the air by coal-fired electricity generation, such as sulphur, also dampen the greenhouse effect.

ECONOMIST: Anti-hero