translation.en: And my theme was this: Our Earth has existed for 45 million centuries, but this one is special — it's the first where one species, ours, has the planet's future in its hands.
translation.zh: 我当时的主题是这样的： 我们的地球已经存在了 四千五百万个世纪了， 但是这个世纪是最特别的—— 第一次有一个物种， 也就是我们人类， 掌控着这个星球的未来。