And they migrated into the rest of the world at two kilometers per year until, within several tens of thousands of years, we occupied every single watershed on the planet and became the most dominant species, And even at that time, with the introduction of agriculture, 8,000, 10,000 years ago we started to see climate change.
以每年2公里速度，仅仅数万年 人类就迁移到世界各地 懂得少量技术以后 我们人类就占领这地球上每一个分水岭地 变成那里的最主要的物种 甚至在那个时候，8000年至1万年以前 伴随农业的发展 我们就开始有气候变化。