The Arctic wasn't always covered in ice.

北极并非总是被冰层覆盖。

The Arctic was not home to any top predators.

北极不是任何顶级掠食者的家园。

One example is the Arctic fox.

一个例子是北极狐。

The arctic relatively is a much warmer place than it used to be.

“相对而言，北极比以前温暖了很多。”

" The arctic changes could also be connected to extreme cold weather."

“北极气候变化可能还与极端寒冷天气有关。”

The Arctic is warming at least three times faster than other parts of the world.

北极变暖的速度至少是世界其它地方的三倍。

The Arctic is warming two to three times faster than the rest of the world.

北极变暖的速度比世界其他地区快两到三倍。

And welcome to the Arctic Circle.

欢迎来到北极圈。

The Arctic Ocean's to my north and the Southern Ocean's to my south.

我的北部是北冰洋，南部是南冰洋。

The Arctic has been warming at two times the worldwide rate for the last 30 years.

过去30年以来，北极变暖的速度已经达到全球增速的两倍。

The Arctic forest-regions are of still greater extent than the vast treeless plains which they encircle.

北极森林地区所覆盖的面积仍然要比那片辽阔的无树木生长的荒原地区还要宽广。

Previously, scientists noticed pollutants arriving in the Arctic with the wind.

以前，科学家注意到有随着风抵达北极的污染物。

The Arctic, by contrast, gets a lot of polluted air from Europe and North America.

这是因为夏威夷远离人类大规模的聚齐地。相比之下，北极有大量来自欧洲与北美洲的污染空气。

The Arctic predator needs sea ice to move around and find spots where they can catch prey.

这种北极捕食者需要根据海上的浮冰四处流动来确定狩猎地点。

Polar bears only live in the Arctic.

北极熊只生活在北极地区。

The Arctic itself, in models and in real life, was warmer than usual, as were parts of Canada.

而北极圈本身，无论是作为模型还是实际情况，都比平常要温暖，加拿大部分地区也是如此。

The barren snows of the Arctic.

冰雪覆盖的北极地区。

And the Arctic is one piece of that.

北极就是其中的一部分。

And yeah, the Arctic can get pretty cold.

确实，北极很冷。

The Arctic is the newest and most daunting front in the expanding global competition between U.S. and Russia.

在日益扩大的美国和俄罗斯之间的全球竞争中，北极是最新的也是最令人畏惧的前沿。