- We know now.
我们现在已经知晓 - It's why the rapa nui didn't react in time.
当地人为何没及时作出反应 - It's only one of a number of theories,
这只是众多理论之一 - But it has particular relevance to us today.
但今天 对我们意义非凡 - Since 1950, the world's population has almost tripled.
自1950年以来 世界人口几乎翻了三倍 - And since 1950, we have more fundamentally altered our island, the earth,
而且从1950年起 我们对自已的岛屿 地球 - Than in all ofour 200,000-year history.
做出的根本性改变比过去二十万年都多