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。
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