... crop rotation 作物轮作 carbon dioxide concentration 二氧化碳浓度 crude birth rate 粗出生率 ...
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但是，二氧化碳浓度在一直增加。
这是由于大气不能完全支配在水平面上的二氧化碳浓度。
This is because the atmosphere does not have an iron grip on the carbon-dioxide level in surface waters.
如同闪烁开关一样，温度和二氧化碳浓度也在气候的转换中一同回转。
Like a flickering switch, temperatures and carbon dioxide concentrations were gyrating up and down during this climate transition.
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