第四纪冰河时期（Quaternary glaciation），或称作更新世冰河时期(Pleistocene glaciation), 当前冰河时期(current ice age)，或直接叫做冰河时期(the ice age)，开始于258万年前的 上新世晚期，延续到迄今。
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一种理论是“冰川熊”假说。 卡莫德现象反映了从11000年前结束的这个地区冰河时期残留下来的适应性改变。
One theory was the "glacial bear" hypothesis that Kermodism represented a remnant adaptation from the last great ice age, which ended here 11, 000 years ago.
奥陶纪冰河时期发生在4.44亿年前，有记录表明其CO2含量较高。
The Ordovician ice age happened 444 million years ago, and records have suggested that CO2 levels were relatively high then.
早在20000年前，地球正值冰河时期，那时的“腰围”可以说是比较苗条。
Earth had been 'slimming down' following the Ice Age, which finished about 20, 000 years ago.
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