Steel is an alloy of iron and carbon. Coking coal is a source of carbon in the smelting process.

钢是铁与碳的合金，焦煤便是熔炼过程中碳的来源。

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Replacing the steel in a car with carbon fiber would shave hundreds of pounds off its weight.

因为用碳纤维代替钢铁制造汽车将大大减轻车身的整体重量。

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The carbon dioxide released 30 years ago by a steel plant in Pittsburgh that no longer exists has created an externality for people living today.

30年前，匹斯堡的一家钢厂，现在已经不存在了，排放的的二氧化碳形成的外部成本，至今仍然影响着人们的生活。

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Just how many carbon credits a steel mill or data center might need to buy depends on accurate measurement of their emissions.

FORBES: Technology

Later this year, it will take the wraps off a demonstration plant outside of Shanghai that will convert the carbon monoxide from a steel mill into 100, 000 gallons of ethanol a year.

FORBES: LanzaTech Gets $55.8 Million To Convert Carbon Monoxide To Fuel

The carbon is placed next to the steel die form, and very high voltage is sent between the carbon and the steel, creating a powerful arc of heat, which vaporizes the steel in the desired pattern.

FORBES: Magazine Article