1161. Decarbonizing Aluminum: Rolling Out a More Sustainable Sector
- Author:
- William Alan Reinsch and Emily Benson
- Publication Date:
- 02-2022
- Content Type:
- Special Report
- Institution:
- Center for Strategic and International Studies (CSIS)
- Abstract:
- As the effects of climate change intensify, countries and industries alike are seeking new ways to decarbonize to meet emissions targets, avoid carbon border tariffs, and reduce energy costs. Today, energy use in industry is the number one contributor to global greenhouse gas (GHG) emissions. Therefore, decarbonization of heavy industry would have a direct and immediate impact on reducing GHG emissions and slowing climate change. Aluminum is the second most used metal in the world. Its applications are numerous and fundamental, from electrical transmission to defense and construction. Aluminum is also a key input in other goods that help reduce emissions, such as electric vehicles and energy-efficient buildings, meaning that decarbonizing aluminum can help industries that are playing a critical role in global climate efforts. This paper evaluates global progress on sectoral emissions reductions and assesses policies governments can pursue to accelerate decarbonization of the aluminum sector. The aluminum industry consists of three component segments: upstream aluminum, downstream aluminum, and recycled aluminum. The upstream aluminum sector is responsible for the sourcing of raw material components from mined bauxite that is then refined into alumina and smelted into aluminum. Aluminum production is usually accomplished in two phases. In the first stage, bauxite ore is refined to obtain aluminum oxide through the Bayer process. The Hall-Heroult process of smelting the aluminum oxide to release pure aluminum comprises the second stage. Upstream production of aluminum involves the mining of bauxite and refining it into alumina. The downstream segment refers to the production of semi-fabricated aluminum products and their use in a wide range of sectors, from manufacturing and automobiles to construction and consumer products. Aluminum not only offers durability, but also is lightweight and infinitely recyclable, meaning it has clear environmental benefits compared to other similar inputs, such as steel or plastic. While aluminum does offer some environmental benefits, producing it is carbon intensive. Aluminum production processes have changed very little since the 1800s, and many countries continue to rely on coal to produce the electricity required for aluminum production. Globally, the aluminum sector contributes roughly 2 percent of GHG emissions—equivalent to about 1.1 billion tons of carbon dioxide (CO2). Yet demand for aluminum is expected to increase by 50 to 80 percent by 2050. In 2019, the aluminum industry consumed 6 percent of all global coal-fired electricity, exceeding the total amount of coal-fired electricity generated in Europe. That same year, coal-fired electricity used in aluminum electrolysis produced 636 million tons of C02 emissions, or 58 percent of the sector’s carbon footprint. On average, 72 percent of GHG emissions from primary production of aluminum are from electricity, meaning greater use of renewable energy in aluminum production could significantly decrease the sector’s carbon output. According to the Intergovernmental Panel on Climate Change (IPCC), global CO2 emissions need to decrease by 45 percent by 2030 in order to keep global warming below the 1.5 degree threshold. By accelerating the deployment of renewables and designing policies that encourage and support the decarbonization of heavy industry, the private and public sectors can play key roles in helping to reduce carbon emissions, while also continuing to grow the global economy.
- Topic:
- Climate Change, Energy Policy, Renewable Energy, and Carbon Emissions
- Political Geography:
- Global Focus