Earth's polar ice caps are in peril.

地极现在很危险。

Here are polar caps in sunbake deserts, giant volcanoes , mighty canyons.

这里有沙漠的极地沙帽, 巨大的火山、神秘的峡谷。

Today, the planet's two polar caps are largely made up of ice.

今天，星球的两个极冠主要由冰组成。

Huge solar mirrors are put in orbit round Mars to heat the polar ice caps.

巨大的太阳反射镜被射入火星的轨道来给两级冰冠热量。

It's what's thought to be hidden beneath the polar caps that could have massive significance.

是被认为隐藏在极帽下的东西具有重要的意义。

Say goodbye to the white polar ice caps reflecting sunlight that would otherwise bake the planet.

永别了！那反射着阳光的雪白的极地冰帽，而阳光则烘烤着我们的星球。

Higher temperatures will cause the polar ice caps to melt to less than 50% of what they are today.

更高的温度将导致极地冰盖融化到今日的 50％ 以下。

Higher temperatures will cause polar ice caps to mell to less than 50% of what they are today.

高温会导致极地冰盖融化 50%。

That was discovered that Mercury in fact, had what appeared to be polar caps in these first radar images.

而事实上发现水星, 似乎是在雷达图像上有类似的冰帽。

In fact, as much as a third of the Martian atmosphere freezes out every winter to coat the polar ice caps!

实际上，每年冬天会有三分之一的火星大气冻成干冰，覆盖在极地冰盖上！

Researchers from the European Space Agency say it sits beneath the south polar ice cap and is about 20 kilometres wide.

欧洲航天局的研究人员称这些液体位于南极冰盖下方，大约有20千米宽。

At first glance, Mars seems familiar -- polar ice caps, large valleys, liquid water under its surface, and a day barely longer than Earth's.

乍一看，火星似乎令人眼熟——极地冰盖、大山谷、表面下的液态水及仅仅稍长于地球一天。

Three environmentalists died in the polar ice cap.

三个环境学家死在了极地冰冠。

For hundreds of millions of years, the planet had no polar ice caps.

数亿年来，地球上没有极地冰盖。

As our climate warms up, the polar ice caps will begin to melt.

【polar】随着地球气候逐渐变暖，极地的冰冠将开始融化。

There were no polar ice caps, which meant sea levels were much higher.

没有极地冰盖，这意味着 海平面要高得多。

Where does that come from? " " The polar caps? " " Cold air takes up little moisture, Wellington.

那是从哪里来的？” “极地冰冠？” “冷空气吸收的水分很少，惠灵顿。

During much of the Mesozoic era, the world was warmer than today, with no polar ice caps.

在中生代的大部分时间里，世界比今天温暖，没有极地冰盖。

They're visible through simple telescopes on Earth and they are unquestionably the first planetary features noticeable during an approach to Mars through space, the Martian polar caps.

可以通过地球上望远镜看到它们的存在，在经过太空接近火星时，这被清楚地表明为它的第一特征，在火星的极地。

Rising temperature will cause melting of the polar ice caps, and then sea levels will rise.

气温的升高将会导致极地冰冠的融化，从而带来海平面的上升。