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Scientists believe that the entire world beyond Africa was populated from descendants of these two hundred individuals.
科學家認為非洲以外的男女老幼，全都是這兩百人的后代，
Over time our ancestors multiply and spread out;
久而久之，我們的祖先越來越多，
to India, onto Asia and into Europe.
并擴散至印度、亞洲與歐洲。
But while humans head north, a giant wall of ice travels south.
然而人類往北走，一塊巨大的冰墻卻往南走，
Europe, 40,000 years ago.
歐洲，40000年前。
Homo sapiens arrive, only to find a world that's quickly changing.
智人來到這里，卻發現世界變得實在太快了。
It should be the height of summer, but it's getting colder.
這時應是盛夏，天氣卻越來越冷。
The plants are frostbitten, and the rivers are frozen.
植物都被凍傷，河流也結了冰。
Natural changes in the Earth's orbit, CO2 levels, and the flow of warm water around the planet conspire to lower the Earth's temperature.
地球運行軌道的自然變化，二氧化碳濃度，與各地溫水的流動，一齊使地球溫度下降。
The Earth, and its inhabitants, enter an ice age.
地球與地球居民進入冰河時期，
Glaciers as high as skyscrapers creep over the northern hemisphere about a foot every day,
跟摩天大樓一樣高的冰河，以每天30公分的速度覆蓋北半球，
Slow, and powerful, they sculpt the landscape, gouging out great depressions.
它們用緩慢而強大的力量雕塑沿途經過的地表，挖出深深的洼地，
The planet will never look the same again.
地球樣貌徹底改變，
Now, around twenty thousand years ago, they grind to a halt.
兩萬年前冰河突然停止移動。
