Shale gas is an important unconventional source of natural gas.

页岩气是一种重要的非常规天然气的来源。

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Of course, solar activity is just one natural source of climate variability. Volcanic eruptions are another, spewing gas and dust into the atmosphere.

当然，太阳活动仅仅是气候变化的一个自然因素，火山喷发出气体和尘埃进入大气层也会带来这个结果。

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In November the International energy Agency predicted that renewable energy would overtake natural gas to become the second largest source of power generation worldwide within two years.

11月，国际能源机构预测，在两年内，可再生能源将取代天然气成为世界第二大发电能源。

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The Marcellus Shale, for instance, has between 168 trillion and 516 trillion cubic feet of natural gas, making it the second largest natural gas source in the world.

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Oil and natural gas move from source to market, in pipelines or ships, at around 10 to 20 mph.

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And yet what is worrying is that the big firms are largely ignoring natural gas as a source of hydrogen.

ECONOMIST: How green is your hydrogen?