Aluminium companies have launched a raft of aluminium products with lower carbon emissions, largely by either using hydro power or recycled material. Primary aluminium emits on average 16.6 tonnes of CO2 per tonne of metal, according to the International Aluminium Institute, based on 2021 data, making it one of the most carbon-intensive segments of the metals industry. Joint venture between the two groups to commercialise a new technology by 2024 to produce carbon-free aluminium, using a ceramic anode and emitting only oxygen. The Chinese producer has introduced two low-carbon products, HQALoop and HQALight, one made with recycled aluminium and the other from low-carbon aluminium produced in Yunnan using hydro electricity and other renewables. Century markets a low-carbon product with less than 4 tonnes of CO2 made at its plant in Iceland.