It is estimated that some 50 billion tons of CH4 could be trapped in the Siberian Lake permafrost.

据估计，可能约有500亿吨甲烷被困在西伯利亚湖永久冻土中。

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Methane (CH4) is the main constituent of natural gas, and is the result of natural decomposition processes.

甲烷(CH4)是天然气的主要成分，是自然分解过程的产物。

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But a large proportion of global greenhouse gas emissions are actually other gases, such as N2O (nitrous oxide) and CH4 (methane).

但是，全球温室气体排放实际上有相当一部分是其他气体，如N2O(一氧化二氮)和CH4(甲烷)。

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A good example of that is CH4, because the CH bond is polar but symmetrically disposed in space.

甲烷就是一个很好的例子，因为极性键是,空间对称的。

麻省理工公开课 - 固态化学导论课程节选

And, I know I need to come up with four symmetric equi-length bonds, and let's just see, let's draw the structure here.

我想我们需要,4个对称的等长的键，让我们画出CH4的结构。

麻省理工公开课 - 固态化学导论课程节选

And I picked looking at methane so we could see if there are other factors that we're not considering, that we need to maybe tweak our model a little bit, and I think we'll find that we do if we take a look at a polyatomic molecule, methane, CH4 so c h 4.

我选择甲烷这个例子，我们可以看到,如果有一些我们没有考虑到的因素，我们需要修改一下我们的模型，我们看一看,甲烷CH4这个多原子分子，就会知道这一点，甲烷。

麻省理工公开课 - 化学原理课程节选

Fossil CH4 is quick and easy to set up and get up and running.

FORBES: Profile of An Energy Revolution: Japan

The partnerships went by such names as GRP2, Green Earth Land General Partnership and CH4 Florida.

FORBES

Here, ice cores are more valuable (CO2, CH4 and volcanic aerosol changes).

WSJ: Climate Emails: Science and Candor