Iron ore is a key ingredient in steel-making.

石是炼钢的关键成分。

Iron and nickel melted and sank to the core, generating heat like a massive furnace.

和镍融化，汇集到地核产生巨量，就像炼钢炉。

Prices for the coking coal used in steelmaking have risen sharply this year.

用于炼钢的焦煤价格今年幅上涨。

In fact, worldwide, steelmaking is responsible for 5 percent of annual emissions.

实际上，每年炼钢所排放的温室气体占全世界总量的5%。

Carnegie a new but simple method of producing steel.

展示了一种新颖而简单的炼钢方式。

Carneg risks everything he's got on the new plant.

卡内基把全副身家都押在这个新炼钢厂上。

The temperature required to make an authentic Neapolitan pizza is stupidly, unbelievably hot-more blast furnace than broiler.

制作正宗的那不勒斯披萨所需的温度高得离谱，令人难以置信，它更像是炼钢高炉的温度，而非普通烤箱。

In the hot, noisy factories where steel was made, she saw beauty and a subject for her pictures.

在炎、喧闹的炼钢工厂里，她看到了美，也看到了她照片的主题。

The trick? Produce steel the way we make aluminum: use electricity rather than flame.

什么窍门？用制铝的方式炼钢：利用电能而不是火。

To make steel the old-fashioned way, you blast iron ore with heat and purify the resulting molten metal with oxygen.

旧的炼钢方式是加石使其燃烧，然后用氧气净化溶化的水。

When the oxygen is used to make steel, that also emits carbon dioxide.

当氧气被用来炼钢时，也会排放二氧化碳。

As a result, steelmaking accounts for 7-9% of the world's anthropogenic greenhouse-gas emissions.

因此，炼钢占世界人为温室气体排放量的 7-9%。

At the steelworks near the German city of Salzgitter, ironmaking is a dramatic affair.

在德国萨尔茨吉特市附近的炼钢厂，炼是一项惊心动魄的工作。

The Canadian miner plans to spin off its relatively dirty steelmaking coal operations.

这家加拿企计划剥离其相对肮脏的炼钢煤业务。

But mostly it's for making steel.

但主要是为了炼钢。

The men of the steel yards feared Frick as much as they loved " Charlie" Schwab.

炼钢厂的人害怕弗里克， 就像他们爱“查理” 施瓦布一样。

To make steel the old way we first mine iron ore, then burn coal to remove the oxygen from the iron mix.

炼钢的旧方法是，先开采石，然后要燃烧煤来去除混合物中的氧气。

It can be used to make fertilizer, or it can be used to make steel without emissions.

可以用来做肥料，也可以用来炼钢，没有排放。

A more promising path involves making steel from scrap metal in electric-arc furnaces powered with clean energy.

一条更有前景的路径是利用清洁能源驱动的电弧炉，从废金属中炼钢。

At home, traditional integrated producers like U.S. Steel have been overtaken by mini-mills, powered by electricity and non-union workers.

在国内，传统的综合生产商如美国钢公司已被采用电力并雇佣非工会工人的小型炼钢厂超越。