Our ancestors adapted to the universal but irregular global warming since the end of the last great Ice Age, around 10,000 years ago, with dazzling opportunism.

我们的祖先以令人眼花缭乱的机会主义，适应了自上一个大冰期结束后，约1万年前普遍但不规则的全球变暖。

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For example, as the great ice sheets that covered North America during the last ice age steadily melted away, huge volumes of water flowed from them.

例如，随着覆盖北美的大冰原在最后一个冰河时代逐渐融化，大量的水从冰原流出。

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It was not a time of uniform warmth, for then, as always since the Great Ice Age, there were constant shifts in rainfall and temperature.

那并不是一个始终温暖的时期，因为在那时跟大冰期以来的任何时候都一样，降雨量和温度都在不断变化。

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