We can often find Southeast Asias black human race in Chinese historical records. Researchers think that the black may still distribute in the Chinese south regions during the prehistoric period.

东南亚的黑色人种屡见于中国史籍，研究者认为黑人早在史前时期可能还分布于中国南部。

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If the race that we belong to owes anything to any human being, or to any power in the universe, they owe it to these black men.

如果说我们所属的种族对任何人、对宇宙间任何力量应该有所感激的话，应感激的就是黑人。

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In this audio section, BBC World Service environment specialist Richard Black explains the so-called greenhouse effect, global warming, the implications for the human race and the significance of the Kyoto summit.

BBC: See and hear how the world could alter