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Mongol warriors have four horses each.
每个蒙古兵都有四匹马
They can eat and sleep on horseback.
他们可以在马背上吃饭睡觉
No army will travel so far and so fast until World War II.
第二次世界大战前 还没有哪支军队可以如此快的速度行军这么远
They would travel faster than the news of their arrival.
军队到来的讯息还未到 他们已策马而至
Climate change is one of the keys to the human story
气候的变化是人类历史的一个关键
And drives the Mongols to change the world.
它也推动了蒙古人改变世界的进程
93 million miles from earth A surge in solar activity.
在地球九千三百万英里之外 爆发了一场太阳风暴
Blasts of radiation scorch the planet.
辐射冲击波灼烧着地球
It's the beginning of three centuries of global warming.
那是持续三个世纪的全球变暖的开始
Climatic changes in the ancient world,in the pre-modern world,
远古时期气候的变化 在近代世界
directly affected historical events.
直接影响着历史事件
In mongolia, drought turns pasture into desert.
在蒙古 干旱让草地变成沙漠
To survive, the Mongols sweep south,Towards China, the great power in Asia,
为了生存 蒙古人向南迁徙 到达中国 亚洲的霸主
Home to the biggest cities in the world.
同时也是世界上最大城市的所在地
