For the response of the ice sheets to a still warmer world, older periods in geologic time offer parallels.

对于冰川对变暖世界的回应，以前的地质时期也出现过相似的状况。

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In fact, only 18, 000 years ago (a blink of an eye in geologic time), twice this amount of ice covered the northwest of North America.

事实上在18000年前，两倍于现在的南极的冰覆盖了北美的西北部。

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"It must have happened in a matter of weeks, " says Elrick. "What we see here is the death of a peat swamp, a moment in geologic time frozen by an accident of nature."

Elrick说：“当时的那场变故一定是在几周内发生的，我们现在所看到的这片泥炭沼泽遗迹，在地质学时间上只是大自然一次瞬间意外的快照。”

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Any interchange between the two, if it were possible, would have happened already in geologic time, measured in tens of millions of years, not in recent history.

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Neither is significant compared to the known global variations in temperature over geologic time, though any cooling still contradicts the AGW hypothesis.

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Since the beginning of the commercial revolution in the 14th century executives have built or lead their businesses in what scientists call the Holocene climatic epoch, a geologic time period that began at the end of the last ice age around 12, 000 years ago.

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