[00:00:54]This cycle of warming, as huge areas start to absorb rather than

广阔的区域并不反射而是吸收热量

[00:04:53]reflect heat, is the main reason why the Arctic,

因而 和北美面积一样大的北极区域

[00:07:54]a region the size of North America,

变暖速度是地球其他地方的两倍

[00:10:06]is warming twice as fast as the rest of the Earth.

而这个热循环就是罪魁祸首

[00:18:34]So, melting sea ice is a big issue.

正在融化的冰雪是个大问题

[00:21:24]But there's another kind of ice that could have an even more

但还有另外一种冰雪可能会对我们的世界

[00:24:06]dramatic impact on our world.

造成更深刻的影响

[00:27:30]The ice that is found on land.

那就是在陆地上的冰川

[00:32:30]This is fresh water ice,

这是淡水冰

[00:34:36]formed from thousands of years of accumulated snowfall.

是由过去数千年里不断的降雪积累而成的

[00:44:46]This is the front of a glacier,

不管你信不信

[00:47:50]quite a small one, believe it or not.

这是一块非常小冰川的正面

[00:50:35]Glaciers are like rivers of frozen fresh water

冰川就像是冰冻的淡水河

[00:53:48]flowing across the surface of the land.

在陆地上纵横交错

[00:57:15]This one, like most polar glaciers,

像大多数两极冰川一样 这块冰川

[01:00:19]is flowing down from a vast inland ice sheet.

正从一块巨大的内陆冰原上缓缓流下

[01:04:52]And it's what happens to those ice sheets

在这些冰原上发生的变化

[01:07:56]that could radically alter the face of the planet.

会彻底改变地球的面貌

[01:12:40]The Greenland ice sheet is by far the largest in the Arctic.

格林兰冰原是目前北极最大的冰原

[01:16:22]It's two miles thick in places

有些地方有两英里厚

[01:18:39]and six times the size of the United Kingdom.

面积是英国面积的六倍