Clearly, Antarctica’s biodiversity took a hit after the Eocene.

显然，极洲的生物多样性 在始新世之后受到了打击。

Eocene, so, by about 40 million years ago, many of them had gone extinct.

，因此，到约 4000 万年前， 其中许多已经灭绝。

But what happened to these Eocene animals?

但是这些始新世动物发生了什么？

As a result, our world is warming faster than it did back in the Eocene.

结果，我们的世界变暖的速度 比始新世。

So given its size, it was able to support many different ecosystems in the Eocene.

所以考虑到的，能够支持 始新世许多不同的生态系统。

In the United States, Boverisuchus shows up fully-formed and ready to run in the early Eocene.

在国，始新世期，Boverisuchus 已经完全成形并准备好奔跑。

Other residents of Eocene Antarctica probably came from South America as well.

始新世极洲的其他居民可能 也来洲。

Over the course of the Eocene epoch, the climate slowly began to cool.

在始新世时期，气候 开始慢慢变冷。

By the late Eocene, practically all of the primates on those continents died out.

到始新世晚期， 这些陆上几乎所有的灵长类动物都灭绝了。

Floristic Region, but their family was clearly much more widespread during the Eocene Epoch.

植物区的地区发现，但们的科显然 要远得多 在始新世时期广泛存在。

Though the Cretaceous asteroid cleared the stage, mammals did not really get going until 10m years later, in the Eocene epoch.

尽管白垩纪时期的行星灭绝了居统治地位的恐龙，但哺乳动物却一直到1000万年后的始新世才真正兴起繁盛起来。

But about 49 million years ago, in the mid-Eocene, the climate began to get cooler and drier.

但约 4900 万年前，在始新世中期，气候开始变得更凉爽和干燥。

In the early Eocene Epoch, probably before mustelids appeared, our planet had a warm climate.

在始新世期，可能在鼬科动物出现之前，我们的星球气候温暖。

What we do know is that the late Eocene and early Oligocene was a time of global cooling.

我们所知道的是，始新世晚期和 渐新世期是全球降温的时期。

The Paleocene-Eocene Thermal Maximum, 55 million years ago, was so warm, crocodiles swam the waters of the Arctic Circle.

5500 万年前的古新世-始新世极热期非常温暖，以至于鳄鱼在北极圈的水域中游来游去。

Around 34 million years ago, the Eocene-Oligocene Transition  marked the first major period of global cooling and glaciation.

约 3400 万年前，始新世-渐新世过渡标志着全球变冷和冰川作用的第一个主要时期。

Let's rewind back to the Eocene, about 45 million years ago.

让我们回到约 4500 万年前的始新世。

So by the time the Eocene Epoch was over, North America no longer had the right habitat for primates.

因此， 当始新世结束时，北不再有适合灵长类动物的栖息地。

And a big environmental change was also underway in the last half of the Eocene, thanks to the chemistry of mountain-building.

由于造山的化学作用，始新世后半期也发生了巨的环境变化。

And they arrived in South America by the middle Eocene Epoch, around 42 million years ago.

他们在约 4200 万年前的始新世中期到达洲。