Shrinking the Footprint: How Managing Battery Demand Can Cut Billions of Tons of Carbon

Understanding the Lifecycle Emissions of Lithium-Ion Batteries

As global efforts to combat climate change accelerate through the electrification of vehicles and home heating systems, lithium-ion batteries have become a cornerstone of modern energy transition strategy. While widespread adoption of electric vehicles (EVs) and renewable energy storage helps significantly lower carbon emissions overall, the manufacturing process required to build these batteries is not entirely carbon-neutral.

A new study published in One Earth and led by researcher Haiwei Zhou at the University of Melbourne examines the carbon footprint associated with producing lithium-ion batteries. Currently, the researchers estimate that battery manufacturing accounts for roughly 0.18 percent of annual global greenhouse gas emissions. However, as demand scales upward to meet future climate targets, that absolute emission figure could expand by a factor of 10 or more by the year 2050 if production methods and demand patterns remain unchanged.

Supply Chain Improvements Versus Demand Reduction

Researchers analyzed various pathways to mitigate the environmental impact of the battery sector. On the supply side, options include selecting less energy-intensive elements for mining and refining, improving the energy efficiency of manufacturing steps, and scaling up recycling programs to reintroduce materials into the supply loop with a fraction of the energy required for virgin extraction.

The research team found that optimizing supply chain and manufacturing processes could reduce the carbon footprint of an individual battery by up to 34 percent by 2050, avoiding between 3.5 and 4.7 billion tons of cumulative CO2 emissions between 2024 and 2050.

However, the study highlights that demand-side strategies—focused on reducing the total number of batteries that need to be manufactured in the first place—can yield even greater environmental savings.

Practical Implications and Mitigation Strategies

The study outlines several practical approaches to curb total battery demand without hindering the broader transition to clean energy:

• Extending Lifespans: Ensuring that EV batteries last as long as the average vehicle reduces the need for premature replacements, cutting overall battery demand by 29 percent.
• Managing Capacity Growth: Restricting the continuous growth in average EV battery capacity—often driven by consumer demand for larger vehicles and extended driving ranges—could lower demand by an additional 23 percent.
• Shifting Transport Services: Adopting shared mobility services like ride-sharing can optimize vehicle use and lower total fleet and battery requirements by nearly 10 percent.
• Repurposing Cells: Giving end-of-life vehicle batteries a second life in stationary energy storage applications can contribute another 8 percent reduction in demand.

Combined, these demand-side measures could eliminate an estimated 6 to 7.2 billion tons of CO2 between 2024 and 2050, outpacing the projected savings from supply chain efficiencies alone.

What Is Confirmed Versus Unknown

• Confirmed: Current battery manufacturing accounts for a minor fraction of global greenhouse gas emissions, but total output will surge under projected transition scenarios. Implementing both supply chain refinements and demand-management strategies can collectively prevent billions of tons of cumulative carbon emissions through 2050.
• Unknown: Exact regional adoption rates of specific transport services, future consumer preferences regarding vehicle size and battery range, and the precise economic costs associated with implementing each demand-reduction strategy remain subject to future market and policy developments.

Readers interested in verifying the underlying data and methodology can review the published research paper in One Earth (DOI: 10.1016/j.oneear.2026.101863) or access the detailed reporting overview provided through the original source at [Ars Technica](https://arstechnica.com/science/2026/10/batteries-have-a-small-carbon-footprint-we-can-make-it-smaller/).