二氧化碳也是在地球大气中的一个主要的温室气体。

CO2 is also a major greenhouse gas in Earth's atmosphere.

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这些气体溶于大气层中的水汽，形成弱酸。

These gases may dissolve in water in the atmosphere to form weak acids.

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而在过去，二氧化碳可能是以气体的形式存在于大气中。

In the past, the CO2 as gas could have been in the atmosphere.

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而在过去，二氧化碳可能是以气体的形式存在于大气中。

In the past, the CO2 as gas could have been in the atmosphere.

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