When heated in oxygen, coal reacts to form carbon dioxide and hydrogen.

当煤炭在氧气中加热时经化学反应会形成二氧化碳和氢气。

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US experts have found out how to extract carbon dioxide and hydrogen gas from seawater.

美国专家找到了从海水中提取二氧化碳和氢的办法。

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Methane-producing archaea (methanogens) are a type of chemolithotroph that can use carbon dioxide and hydrogen to make methane without ever seeing the sun.

产甲烷古菌（methanogens）是一种化能自养生物，它能利用二氧化碳和氢合成甲烷，而不需要太阳参与。

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"When the gas comes off the digester, it has not only methane in it it also has carbon dioxide And it has a trace of hydrogen sulfide."

VOA: standard.2010.02.23

The company, Air Fuel Syndication, then uses the carbon dioxide and hydrogen to produce methanol which in turn is passed through a gasoline fuel reactor, creating petrol.

FORBES: Insane Technology Watch: Making Petrol From Air

The mice's consumption of oxygen and production of carbon dioxide dropped ten minutes after they began inhaling hydrogen sulphide and remained extremely low as long as the gas was administered.

ECONOMIST: Researchers find hydrogen sulphide can lower metabolism

This gas contains approximately 80% of the original energy content of the coal, and is a combination of hydrogen, carbon monoxide, carbon dioxide, and methane.

FORBES: Underground Coal Gasification: A Trend Worth Watching