Natural cement found in industrial waste reacts with ocean water to form rocks in just 35 years, instead of millions.

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The waste material humans are producing in creating the modern world is going to have an "irreversible impact on our future".

Both are tapped off. The slag is discarded. The matte goes into a ladle holding 30 tons, and a converter. Air bubbled through removes the sulphur, and the silica is added to form a slag with the iron.