These technologists are working to create zero-emissions aluminium

Traditionally, smelting extracts aluminium from aluminium oxide, known as ‘alumina’. This happens when an electric current is passed over alumina in a smelter in a process called electrolysis. The current forces alumina to react with carbon to create primary aluminium but the process also produces CO2. Now, aluminium company Hydro is developing a zero-emission process, called HalZero.