以前二氧化碳的含量水平变化是因为自然因素，像持续数千年缓慢进行的岩石风化。
Previous changes in carbon dioxide levels were due to natural factors, such as rock weathering, and occurred very sluggishly, over many millenia.
既然世界没能力快速遏制二氧化碳的排放，就该从相对次要的污染因素方面着手。
The world’s inability quickly to curb carbon dioxide should prompt action on these only comparatively minor factors.
而结果是，影响史前气温转变的最大因素一直是空气中二氧化碳含量的摆动。
And as it turns out, the biggest factor affecting prehistoric temperature shifts has been fluctuating levels of carbon dioxide in the air.
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