But CO2 levels continue to rise.

但是，二氧化碳浓度在一直增加。

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As a result CO2 levels fell and the greenhouse effect weakened, triggering an ice age.

其后果就是CO 2含量下降，温室效应减弱并引发了冰河时代的到来。

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As a result, human emissions from factories and transport tend to lead to higher CO2 levels here.

其结果是来自工厂和运输的排放易于导致这里的二氧化碳水平更高。

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This suggests that there are more, many more, things responsible for climate than CO2 levels.

BBC: Global warming: Andrew Pendleton and James Delingpole

To determine CO2 levels before the introduction of modern stations, scientists must use so-called proxy measurements.

BBC: Carbon dioxide passes symbolic mark

One of these can be used to describe CO2 levels over the past 800, 000 years.

BBC: Carbon dioxide passes symbolic mark