Humans weren't at risk of dying out during the PETM, because we didn't exist.

世–世极热事件时人类并没有濒临灭绝的危险，因为我们还不存。

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

世时期，气 慢慢变冷。

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 比世早。

But what happened to these Eocene animals?

但是这些世动物发生了什么？

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

世南极洲的其他居民可能 也来自南美洲。

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

显然，南极洲的生物多样性 世之后受到了打击。

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

到世晚期， 这些大陆上几乎所有的灵长类动物都灭绝了。

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

所以考虑到它的大小，它能够支持 世许多不同的生态系统。

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

植物区的地区发现，但它们的科显然 要远得多 世时期广泛存。

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

但大约 4900 万年前，世中期，气变得更凉爽和干燥。

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

世早期，可能鼬科动物出现之前，我们的星球气温暖。

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

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

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，世晚期和 渐世早期是全球降温的时期。

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

让我们回到大约 4500 万年前的世。

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

5500 万年前的世-世极热期非常温暖，以至于鳄鱼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.

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

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

他们大约 4200 万年前的世中期到达南美洲。

For example, Juxia from the Late Eocene epoch of China was about the size of a horse.

例如，中国世晚期的巨霞大约有马那么大。

Or there's the Eocene, more than 34 million years ago, a hothouse time during which the continents drifted into their present configuration.

或者是超过 3400 万年前的世，这是一个温室时代，此期间大陆逐渐变成了现的形态。

You see the Amazon formed during the Eocene epoch, up to 56 million years ago when the whole world was a lot warmer and wetter.

你可以看到亚马逊河形成于世时期，距今约5600万年前，当时的地球要温暖得多，湿润得多。