But they're about to begin an epic journey north through the bleak and forbidding tundra.

但它们即将开始一场史诗之旅，向北穿越荒凉寒冷的苔原禁地。

But whether you're one of those seasoned skeptics of the cold, as long as you have a good latitude, you could see why people Alpine a way to have fundra in the tundra.

但不管是否是那些对寒冷有经验的怀疑论者，只要有一个很好的，就能明白为什么阿尔卑斯山的人们会在苔原上有一个住所。

Many end up at airports, whose wide concrete spaces resemble the Arctic Tundra.

许多动物最后都去了机场，那里宽阔的混凝土空间就像北极苔原一样。

Previously, the color for the Tundra area that is North of Canada was this light gray, which in reality was not actually how it looked in satellite imagery, which is these stone-deep grays.

以前，加拿大北部苔原地区的颜色是浅灰色，实际上这并不是卫星图像中的颜色，卫星图显示是石头深灰色。

Over three million wild reindeer migrate across the tundra.

超过三百万头的野生驯鹿加入穿越苔原的迁徙之旅。

As the tundra is very windy, this causes deep drifts to surround the shrubs.

因为苔原经常刮风，这会导致深处的水流包围灌木丛。

There was no breeze, nowhere to go for a shade and seemingly endless miles of tundra as far as my eyes could see.

那里没有风，也没有任何荫蔽之处，在我视野里的是一望无际的苔原。

But which places—Arctic tundra or Amazon rainforest—are most vulnerable to such climate change?

但是那些地方更容易受气候变化影响呢？是北极苔原还是亚马逊热带雨林呢？

For lemmings, small fussy rodents, there is no place more comfortable than the Arctic tundra.

对于旅鼠这种小的啮齿类动物来说，没有比北极苔原更舒适的地方了。

" Let us gather tundra grass and thatch the roof, " Maud said.

" 我们还是去弄苔原草苫屋顶吧。" 茅德说。

For lemmings, small fussy rodents, there is no place more comfortable than the Arctic tundra.Their presence ensured their well-being of other tundra inhabitants that eat them: owls, Arctic foxes, weasels, eagles, gulls and cranes.

对于旅鼠这种小的啮齿类动物来说，没有比北极苔原更舒适的地方了。它们的存在确保了其他苔原栖息者的福祉，猫头鹰、北极狐、黄鼠狼、鹰、海鸥和鹤都以它们为食。

The bear recently arrived from Louisville, Kentucky and is part of the Arctic tundra exhibit, which will teach the visitors about the impact of climate changes having on polar bears.

这只北极熊最近从肯塔基州的路易维尔来这里，是北极苔原展览的一部分，旨在教给游客气候变化对北极熊的影响。

Next up, a snowy owl normally found in the Arctic tundra shows up 3,000 miles away amid palm trees and beaches of sunny southern California.

接下来的新闻，一只雪鸮出现在了加利福尼亚州南部长满棕榈树的阳光沙滩上，但是雪鸮一般生活在距离加利福尼亚州3000英里以外的北极苔原带。

There are five main types of biomes — forest, desert, tundra, aquatic, and grassland — but they don't all fit together perfectly like puzzle pieces.

有五种主要类型的生物群落——森林、沙漠、苔原、水生和草原——但它们并不像拼图一样完美地组合在一起。

While caribou are most common on northern tundras, a subspecies lives in Canadian forests, offering clues to how the ancient caribou might have thrived.

虽然北美驯鹿在北部苔原上最常见，但加拿大森林中生活着一个亚种，这为古代驯鹿是如何繁衍生息提供了线索。

For thousands of years, woolly mammoths lived off of the grasses and shrubs of the tundras in Eurasia and North America.

几千年来，长毛猛犸象以欧亚大陆和北美苔原上的草和灌木为食。

Competition for the grassy tundra of the plateau is increasing from other reindeer, from wind farms, pylons, roads, and mines.

来自其他驯鹿、风电场、塔架、道路和矿山的对高原草地苔原的竞争正在加剧。

The upper timberline, like the snow line, is highest in the tropics and lowest in the Polar Regions.

通常从山坡上的森林没有树的苔原是一种非常戏剧化的转变。在一个垂直距离只有几十米的地方，树木这种生命形式就消失了，取代之的是低矮的灌木、草本植物和牧草。这种快速过渡的区域被称为上行树带界线或林木线。在许多干旱的地区存在着下行树带界线，在这里由于缺乏水分森林变成干草原，甚至在最下端会出现沙漠。

And once it thaws, that collapsing ground can drastically alter the vast expanse of the Arctic's tundra and boreal forest, and it can also threaten the homes and lifeways of Arctic residents.

一旦永久冻土开始融化，坍塌的土地会彻底改变北极地区大片的苔原和北部针叶林，这也威胁着北极地区居民的家园和生活方式。

Won't the shrub stop and it'll turn back into tundra?

灌木丛会停止生长并变回苔原吗？