Under its surface lies a climatic time bomb: Methane,
其表面下埋藏着一种气候定时炸♥弹♥ 甲烷

Question

Here in Siberia and elsewhere across the globe,
在西伯利亚和一些其他的地方
It is so cold that the ground is constantly frozen.
由于天气寒冷形成了冻土层
It's known as permafrost.
这些都是永久冻土层
Under its surface lies a climatic time bomb: Methane,
其表面下埋藏着一种气候定时炸♥弹♥ 甲烷
A greenhouse gas 20 times more powerful than carbon dioxide.
一种比二氧化碳厉害20倍的温室气体
If the permafrost melts, the methane released...
如果永冻土融化释放出甲烷
Would cause the greenhouse effect to race out of control,
温室效应将会到达失控的地步

来自《家园第二部分 Home Part2》第 448 行