So the spread of agriculture could very well have a profound effect on the composition of Earth's atmosphere.

所以农业的扩张很可能对地球大气的组成产生深远的影响。

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The answer to this riddle lies in the metabolic activity of early photosynthetic life-forms that slowly but surely transformed the chemical composition of Earth's atmosphere.

这个谜题的答案在于早期光合生命形式的新陈代谢活动，这种活动缓慢但一定改变了地球大气的化学成分。

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Thus, the nutrient composition of sea water is maintained by organisms which also stabilize the improbable composition of the atmosphere.

海水中的养分保存在有机物中，有机物对大气层奇异的构成也有稳定作用。

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But the strength of the greenhouse effect depends on the chemical composition of the atmosphere, because the phenomenon is due to the absorption of infra-red radiation by various gases in the air.

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"The text of the Clean Air Act makes plain that Congress intended it as a measure to 'clean' the air of pollutants, not to alter the overall composition of the Earth's atmosphere, " argues the Alliance of Automobile Manufacturers, an auto industry lobbying group, in a brief.

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There were instruments to measure the composition of the atmosphere of Mars as it entered the atmosphere.

NPR: Revisiting the Viking Missions to Mars