![A slide showing that the Conventional Smelting Technology uses a carbon anode, producing CO2. With the more productive, lower costing, and greener Inert Anode Smelting Technology which uses an inert anode, the resulting emission is pure oxygen. ](https://www.alcoa.com/sustainability/en/elysis/images/elysis-slide.jpg) ELYSIS refers to the process at the center of aluminum smelting, the electrolysis of alumina. The technology could eliminate 6.5 million metric tons of annual greenhouse gas emissions, if fully implemented at existing aluminum smelters in Canada, an amount equal to taking nearly 1.8 million light-duty vehicles off the road.