Carbon Emissions

Flaming cauldrons of molten metal have long been the [primary:preliminary] venues for steel production. But blast furnaces require a lot of coal, which means greenhouse gas [pollution:position] . In fact, worldwide, steel making is responsible for 5 percent of annual emissions. But scientists working on a way to harvest [oxygen:oxide] from the iron oxide in lunar soil for future moon bases realized that they happened on a better way to make [steel:feel] here on Earth. The trick? Produce steel the way we make [aluminum:platinum] : use electricity rather than flame. To make steel the old-fashioned way, you blast iron ore with heat and purify the resulting [molten:melted] metal with oxygen.