There is evidence in this ice-core record of seven periods when the ice caps expanded, and each of them shows a steady decline in the level of greenhouse gases after the ice receded again.
在冰核中有证据显示两极的冰盖曾经七次扩大，并且每一次扩大都伴随着温室气体排放的明显减少，直到冰盖再次缩小。
Thee next step will be to point to a single piece of the geological record (an ice core, perhaps, or samples from lake sediments) that can serve as the officially accepted reference point.
下一步的焦点就是一条地质记录（关于冰核，又或许仅仅是湖泊沉积物）。它是官方所能接受的参考数据。
Thee next step will be to point to a single piece of the geological record (an ice core, perhaps, or samples from lake sediments) that can serve as the officially accepted reference point.
下一步的焦点就是一条地质记录（关于冰核，又或许仅仅是湖泊沉积物）。它是官方所能接受的参考数据。
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