Sustainability Assessment in Aluminum and Copper Industries

Sustainability assessment in the aluminium and copper sectors employs a suite of quantitative tools to evaluate environmental, economic and social impacts across material lifecycles. Aluminium production, dominated by energy‐intensive electrolysis, contributes significantly to global greenhouse gas emissions and air pollutants, driving efforts to compare primary and recycled pathways and to test novel smelter technologies. Copper, essential to infrastructure and low‐carbon transitions, faces challenges in securing raw supplies, optimising scrap flows and managing supply chain disruptions. Integrated approaches, including life cycle assessment and material flow analysis, reveal hotspots in resource extraction, refining and end‐of‐life recycling. Assessments guide decarbonisation strategies such as inert anode adoption, grid‐decarbonisation, supply chain resilience to policy shocks and circular economy transitions that prioritise reuse and enhanced recovery rates.

Research from Nature Portfolio

Recent studies have constructed a global aluminium emissions inventory covering nearly all primary smelters and captive power units, showing that dependence on fossil‐fuel generation rose markedly between 2012 and 2021. Scenario modelling indicates that early retirement of these units and retrofitting at least one-third of facilities with inert anodes by mid-century are essential to meet net-zero targets. Separately, a dynamic analysis of the copper supply chain has modelled the effects of major disruptions including import bans on scrap and pandemic-related shocks. Findings reveal that reducing scrap imports can paradoxically boost domestic primary refining and associated CO₂ emissions, unless balanced by increased refined copper imports, and highlight the sensitivity of emissions to policy and economic perturbations.

Sustainability Assessment in Aluminum and Copper Industries publication trend

The graph below shows the total number of articles in sustainability assessment in aluminum and copper industries across all publications each year (not limited to Nature Index journals).

Technical terms

Life Cycle Assessment (LCA): A methodology to quantify environmental impacts of a product or process from raw material extraction to end-of-life.

Material Flow Analysis (MFA): A systematic assessment of the flows and stocks of materials within a defined system boundary over time.

Primary Production: The manufacture of metal directly from mined ore through processes such as smelting and refining.

Secondary Metal: Metal recovered from end-of-life scrap or process residues and reintroduced into the production cycle.

Inert Anode Technology: An emerging smelting approach replacing carbon anodes with non-consumable materials to eliminate perfluorocarbon emissions.

Emissions Intensity: The ratio of greenhouse gas emissions to a unit of production, often expressed as tonnes of CO₂-equivalent per tonne of metal.

References

1. Different technology packages for aluminium smelters worldwide to deliver the 1.5 °C target. Nature Climate Change (2025).
2. Life Cycle Energy Consumption and Greenhouse Gas Emissions Analysis of Primary and Recycled Aluminum in China. Processes (2022).
3. Emission impacts of China’s solid waste import ban and COVID-19 in the copper supply chain. Nature Communications (2021).
4. A comparison of copper use in China and India as a proxy for their economic development. Resources Policy (2023).
5. Assessing China’s potential for reducing primary copper demand and associated environmental impacts in the context of energy transition and “Zero waste” policies. Waste Management (2022).